Big-Data-HPC-Platform/ecl/hthor/hthor.cpp

/*##############################################################################

    HPCC SYSTEMS software Copyright (C) 2012 HPCC Systems®.

    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.
    You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

    Unless required by applicable law or agreed to in writing, software
    distributed under the License is distributed on an "AS IS" BASIS,
    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    See the License for the specific language governing permissions and
    limitations under the License.
############################################################################## */
#include <algorithm>
#include "hthor.ipp"
#include "jexcept.hpp"
#include "jmisc.hpp"
#include "jthread.hpp"
#include "jsocket.hpp"
#include "jprop.hpp"
#include "jdebug.hpp"
#include "jlzw.hpp"
#include "jisem.hpp"
#include "roxiedebug.hpp"
#include "roxierow.hpp"
#include "roxiemem.hpp"
#include "eclhelper.hpp"
#include "workunit.hpp"
#include "jfile.hpp"
#include "keybuild.hpp"

#include "rmtclient.hpp"

#include "hrpc.hpp"
#include "hrpcsock.hpp"

#include "dafdesc.hpp"
#include "dautils.hpp"
#include "dasess.hpp"
#include "dadfs.hpp"
#include "thorfile.hpp"
#include "thorsort.hpp"
#include "thorparse.ipp"
#include "thorxmlwrite.hpp"
#include "rtlformat.hpp"
#include "thorcommon.hpp"
#include "jsmartsock.hpp"
#include "thorstep.hpp"
#include "eclagent.ipp"
#include "roxierowbuff.hpp"
#include "ftbase.ipp"
#include "rtldynfield.hpp"
#include "rtlnewkey.hpp"

#include "thormeta.hpp"
#include "thorread.hpp"

#include "ws_dfsclient.hpp"


#define EMPTY_LOOP_LIMIT 1000

static unsigned const hthorReadBufferSize = 0x10000;
static offset_t const defaultHThorDiskWriteSizeLimit = I64C(10*1024*1024*1024); //10 GB, per Nigel

using roxiemem::IRowManager;
using roxiemem::OwnedRoxieRow;
using roxiemem::OwnedRoxieString;
using roxiemem::OwnedConstRoxieRow;

IRowManager * theRowManager;

void setHThorRowManager(IRowManager * manager)
{
    theRowManager = manager;
}

IRowManager * queryRowManager()
{
    return theRowManager;
}

void throwOOMException(size_t size, char const * label)
{
    throw MakeStringException(0, "Out of Memory in hthor: trying to allocate %" I64F "u bytes for %s", (unsigned __int64) size, label);
}

void * checked_malloc(size_t size, char const * label)
{
    void * ret = malloc(size);
    if(!ret)
        throwOOMException(size, label);
    return ret;
}

void * checked_calloc(size_t size, size_t num, char const * label)
{
    void * ret = calloc(size, num);
    if(!ret)
        throwOOMException(size*num, label);
    return ret;
}

inline bool checkWriteIsCompressed(unsigned int flags, size32_t fixedSize, bool grouped)
{
    return ((flags & TDWnewcompress) || ((flags & TDXcompress) && ((0 == fixedSize) || (fixedSize+(grouped?1:0) >= MIN_ROWCOMPRESS_RECSIZE))));
}

inline bool checkReadIsCompressed(unsigned int flags, size32_t fixedSize, bool grouped)
{
    return ((flags & TDXcompress) && ((0 == fixedSize) || (fixedSize+(grouped?1:0) >= MIN_ROWCOMPRESS_RECSIZE)));
}

//=====================================================================================================

//=====================================================================================================

CRowBuffer::CRowBuffer(IRecordSize * _recsize, bool _grouped) : recsize(_recsize), grouped(_grouped)
{
    fixsize = recsize->getFixedSize();
    count = 0;
    index = 0;
}

void CRowBuffer::insert(const void * next)
{
    buff.append(next);
    count++;
}

bool CRowBuffer::pull(IHThorInput * input, unsigned __int64 rowLimit)
{
    while(true)
    {
        OwnedConstRoxieRow next(input->nextRow());
        if(!next)
        {
            next.setown(input->nextRow());
            if(!next)
                break;
            if(grouped)
                buff.append(NULL);
        }
        insert(next.getClear());
        if(count > rowLimit)
            return false;
    }
    return true;
}

void CRowBuffer::clear()
{
    buff.clear();
    index = 0;
    count = 0;
}

const void * CRowBuffer::next()
{
    if(buff.isItem(index))
        return buff.itemClear(index++);
    else
        return NULL;
}


ILocalOrDistributedFile *resolveLFNFlat(IAgentContext &agent, const char *logicalName, const char *errorTxt, bool optional, bool isPrivilegedUser)
{
    Owned<ILocalOrDistributedFile> ldFile = agent.resolveLFN(logicalName, errorTxt, optional, true, AccessMode::tbdRead, nullptr, isPrivilegedUser);
    if (!ldFile)
        return nullptr;
    IDistributedFile *dFile = ldFile->queryDistributedFile();
    if (dFile && isFileKey(dFile))
        throw MakeStringException(0, "Attempting to read index as a flat file: %s", logicalName);
    return ldFile.getClear();
}

bool isRemoteReadCandidate(const IAgentContext &agent, const RemoteFilename &rfn)
{
#ifndef _CONTAINERIZED
    if (!agent.queryWorkUnit()->getDebugValueBool("forceRemoteDisabled", false))
    {
        if (!rfn.isLocal())
            return true;
        StringBuffer localPath;
        rfn.getLocalPath(localPath);
        if (agent.queryWorkUnit()->getDebugValueBool("forceRemoteRead", testForceRemote(localPath)))
            return true;
    }
#endif
    return false;
}

//=====================================================================================================

CHThorActivityBase::CHThorActivityBase(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorArg & _help, ThorActivityKind _kind, EclGraph & _graph)
: help(_help), kind(_kind), graph(_graph), agent(_agent), outputMeta(help.queryOutputMeta()), activityId(_activityId), subgraphId(_subgraphId)
{
}

void CHThorActivityBase::setInput(unsigned index, IHThorInput *_input)
{
    assertex(index == 0);
    input = _input;
}

IHThorInput *CHThorActivityBase::queryOutput(unsigned index)
{
    agent.fail(255, "internal logic error: CHThorActivityBase::queryOutput");
    // never returns....
    return NULL;
}

void CHThorActivityBase::ready()
{
    if (input)
        input->ready();
    if (needsAllocator())       
        createRowAllocator();   
    initialProcessed = processed;
}

CHThorActivityBase::~CHThorActivityBase()
{
    ::Release(rowAllocator);
}
void CHThorActivityBase::createRowAllocator()
{
    if (!rowAllocator) 
        rowAllocator = agent.queryCodeContext()->getRowAllocator(outputMeta.queryOriginal(), activityId);
}

__int64 CHThorActivityBase::getCount()
{
    throw MakeStringException(2, "Internal error: CHThorActivityBase::getCount");
    return 0;
}

void CHThorActivityBase::execute()
{
    agent.fail(255, "internal logic error: CHThorActivityBase::execute");
}

void CHThorActivityBase::extractResult(unsigned & len, void * & ret)
{
    agent.fail(255, "internal logic error: CHThorActivityBase::extractResult");
}

void CHThorActivityBase::stop()
{
    if (input)
        input->stop();
}

void CHThorActivityBase::resetEOF()
{
    if (input)
        input->resetEOF();
}

void CHThorActivityBase::updateProgress(IStatisticGatherer &progress) const
{
    if (queryOutputs()>0)
        updateProgressForOther(progress, activityId, subgraphId);
    if (input)
        input->updateProgress(progress);
}

void CHThorActivityBase::updateProgressForOther(IStatisticGatherer &progress, unsigned otherActivity, unsigned otherSubgraph) const
{
    updateProgressForOther(progress, otherActivity, otherSubgraph, 0, processed);
}

void CHThorActivityBase::updateProgressForOther(IStatisticGatherer &progress, unsigned otherActivity, unsigned otherSubgraph, unsigned whichOutput, unsigned __int64 numProcessed) const
{
    StatsEdgeScope scope(progress, otherActivity, whichOutput);
    progress.addStatistic(StNumRowsProcessed, numProcessed);
    progress.addStatistic(StNumStarts, 1);  // wrong for an activity in a subquery
    progress.addStatistic(StNumStops, 1);
    progress.addStatistic(StNumSlaves, 1);  // MORE: A bit pointless for an hthor graph
}

ILocalEclGraphResults * CHThorActivityBase::resolveLocalQuery(__int64 graphId)
{
    return static_cast<ILocalEclGraphResults *>(agent.queryCodeContext()->resolveLocalQuery(graphId));
}

IException * CHThorActivityBase::makeWrappedException(IException * e) const
{
    if(dynamic_cast<IHThorException *>(e) ||  dynamic_cast<IUserException *>(e))
        return e;
    else
        return makeHThorException(kind, activityId, subgraphId, e);
}

IException * CHThorActivityBase::makeWrappedException(IException * e, char const * extra) const
{
    if(dynamic_cast<IHThorException *>(e) ||  dynamic_cast<IUserException *>(e))
        return e;
    else
        return makeHThorException(kind, activityId, subgraphId, e, extra);
}

bool CHThorActivityBase::isPassThrough()
{
    return false;
}

//=====================================================================================================

CHThorSimpleActivityBase::CHThorSimpleActivityBase(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorArg & _help, ThorActivityKind _kind, EclGraph & _graph) : CHThorActivityBase(_agent, _activityId, _subgraphId, _help, _kind, _graph)
{
}

IHThorInput * CHThorSimpleActivityBase::queryOutput(unsigned index) 
{ 
    assertex(index == 0);
    return this; 
}

bool CHThorSimpleActivityBase::isGrouped()
{ 
    return input ? input->isGrouped() : outputMeta.isGrouped();
}

IOutputMetaData * CHThorSimpleActivityBase::queryOutputMeta() const
{
    return outputMeta;
}

//=====================================================================================================

class CHThorClusterWriteHandler : public ClusterWriteHandler
{
    IAgentContext &agent;
public:
    CHThorClusterWriteHandler(char const * _logicalName, char const * _activityType, IAgentContext &_agent) 
        : ClusterWriteHandler(_logicalName, _activityType), agent(_agent)
    {
    }

private:
    virtual void getTempFilename(StringAttr & out) const
    {
        StringBuffer buff;
        agent.getTempfileBase(buff).append(PATHSEPCHAR).appendf("cluster_write_%p.%" I64F "d_%u", this, (__int64)GetCurrentThreadId(), GetCurrentProcessId());
        out.set(buff.str());
    }
};

ClusterWriteHandler *createClusterWriteHandler(IAgentContext &agent, IHThorIndexWriteArg *iwHelper, IHThorDiskWriteArg *dwHelper, const char * lfn, StringAttr &fn, bool extend)
{
    //In the containerized system, the default data plane for this component is in the configuration
    StringBuffer defaultCluster;
    getDefaultStoragePlane(defaultCluster);
    Owned<CHThorClusterWriteHandler> clusterHandler;
    unsigned clusterIdx = 0;
    while(true)
    {
        OwnedRoxieString helperCluster(iwHelper ? iwHelper->getCluster(clusterIdx++) : dwHelper->getCluster(clusterIdx++));
        const char *cluster = helperCluster;
        if (!helperCluster && (clusterIdx == 1))
        {
            if (defaultCluster.length())
                cluster = defaultCluster;
        }
        if (!cluster)
            break;
        if(!clusterHandler)
        {
            if(extend)
                throw MakeStringException(0, "Cannot combine EXTEND and CLUSTER flags on disk write of file %s", lfn);
            clusterHandler.setown(new CHThorClusterWriteHandler(lfn, "OUTPUT", agent));
        }
        clusterHandler->addCluster(cluster);
    }
    if(clusterHandler)
    {
        clusterHandler->getLocalPhysicalFilename(fn);
    }
    else if (!agent.queryResolveFilesLocally())
    {
        StringBuffer filenameText;
        bool wasDFS;
        makeSinglePhysicalPartName(lfn, filenameText, true, wasDFS);
        fn.set(filenameText.str());
    }
    else
    {
        fn.set(lfn);
    }
    StringBuffer dir;
    splitFilename(fn, &dir, &dir, NULL, NULL);
    recursiveCreateDirectory(dir.str());
    return clusterHandler.getClear();
}

//=====================================================================================================

CHThorDiskWriteActivity::CHThorDiskWriteActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorDiskWriteArg &_arg, ThorActivityKind _kind, EclGraph & _graph) : CHThorActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(_arg)
{
    incomplete = false;
}

CHThorDiskWriteActivity::~CHThorDiskWriteActivity()
{
    diskout.clear();
    if(incomplete)
    {
        PROGLOG("Disk write incomplete, deleting physical file: %s", filename.get());
        diskout.clear();
        outSeq.clear();
        file->remove();
    }
}

void CHThorDiskWriteActivity::ready()       
{ 
    CHThorActivityBase::ready(); 
    grouped = (helper.getFlags() & TDXgrouped) != 0;
    extend = ((helper.getFlags() & TDWextend) != 0);
    overwrite = ((helper.getFlags() & TDWoverwrite) != 0);
    resolve();
    uncompressedBytesWritten = 0;
    numRecords = 0;
    sizeLimit = agent.queryWorkUnit()->getDebugValueInt64("hthorDiskWriteSizeLimit", defaultHThorDiskWriteSizeLimit);
    rowIf.setown(createRowInterfaces(input->queryOutputMeta(), activityId, 0, agent.queryCodeContext()));
    open();
}

void CHThorDiskWriteActivity::execute()
{
    // Loop thru the results
    numRecords = 0;
    while (next()) 
        numRecords++;
    finishOutput();
}

void CHThorDiskWriteActivity::stop()
{
    outSeq->flush(NULL);
    if(blockcompressed)
        uncompressedBytesWritten = outSeq->getPosition();
    close();
    updateWorkUnitResult(numRecords);
    if((helper.getFlags() & (TDXtemporary | TDXjobtemp) ) == 0 && !agent.queryResolveFilesLocally())
        publish();
    incomplete = false;
    if(clusterHandler)
        clusterHandler->finish(file);
    CHThorActivityBase::stop();
    if (helper.getFlags() & TDXvarfilename)
        filename.clear();
}

void CHThorDiskWriteActivity::resolve()
{
    OwnedRoxieString rawname = helper.getFileName();
    mangleHelperFileName(mangledHelperFileName, rawname, agent.queryWuid(), helper.getFlags());
    assertex(mangledHelperFileName.str());
    if((helper.getFlags() & (TDXtemporary | TDXjobtemp)) == 0)
    {
        Owned<ILocalOrDistributedFile> f = agent.resolveLFN(mangledHelperFileName.str(),"Cannot write, invalid logical name",true,false,AccessMode::tbdWrite,&lfn,defaultPrivilegedUser);
        if (f)
        {
            if (f->queryDistributedFile())
            {
                // An already existing dali file
                if(extend)
                    agent.logFileAccess(f->queryDistributedFile(), "HThor", "EXTENDED", graph);
                else if(overwrite) {
                    LOG(MCoperatorInfo, "Removing %s from DFS", lfn.str());
                    agent.logFileAccess(f->queryDistributedFile(), "HThor", "DELETED", graph);
                    if (!agent.queryResolveFilesLocally())
                        f->queryDistributedFile()->detach();
                    else
                    {
                        Owned<IFile> file = createIFile(lfn);
                        if (file->exists())
                            file->remove();
                    }
                }
                else
                    throw MakeStringException(99, "Cannot write %s, file already exists (missing OVERWRITE attribute?)", lfn.str());
            }
            else if (f->exists() || f->isExternal() || agent.queryResolveFilesLocally())
            {
                // special/local/external file
                if (f->numParts()!=1)
                    throw MakeStringException(99, "Cannot write %s, external file has multiple parts)", lfn.str());
                RemoteFilename rfn;
                f->getPartFilename(rfn,0);
                StringBuffer full;
                if (rfn.isLocal())
                    rfn.getLocalPath(full);
                else
                    rfn.getRemotePath(full);
                filename.set(full);
                if (isSpecialPath(filename))
                {
                    PROGLOG("Writing to query %s", filename.get());
                    return;
                }
                if (stdIoHandle(filename)>=0) {
                    PROGLOG("Writing to %s", filename.get());
                    return;
                }
                Owned<IFile> file = createIFile(filename);
                if (file->exists())
                {
                    if (!overwrite) 
                        throw MakeStringException(99, "Cannot write %s, file already exists (missing OVERWRITE attribute?)", full.str());
                    file->remove();
                }

                //Ensure target folder exists
                if (!recursiveCreateDirectoryForFile(filename.get()))
                {
                    throw MakeStringException(99, "Cannot create file folder for %s", filename.str());
                }

                PROGLOG("Writing to file %s", filename.get());
            }
            f.clear();
        }
        if (filename.isEmpty())  // wasn't local or special (i.e. DFS file)
        {
            CDfsLogicalFileName dfsLogicalName;
            dfsLogicalName.allowOsPath(agent.queryResolveFilesLocally());
            if (!dfsLogicalName.setValidate(lfn.str()))
            {
                throw MakeStringException(99, "Could not resolve DFS Logical file %s", lfn.str());
            }

            clusterHandler.setown(createClusterWriteHandler(agent, NULL, &helper, dfsLogicalName.get(), filename, extend));
        }
    }
    else
    {
        StringBuffer mangledName;
        mangleLocalTempFilename(mangledName, mangledHelperFileName.str(), nullptr);
        filename.set(agent.noteTemporaryFile(mangledName.str()));
        PROGLOG("DISKWRITE: using temporary filename %s", filename.get());
    }
}

void CHThorDiskWriteActivity::open()
{
    // Open an output file...
    file.setown(createIFile(filename));
    serializedOutputMeta.set(input->queryOutputMeta()->querySerializedDiskMeta());//returns outputMeta if serialization not needed

    Linked<IRecordSize> groupedMeta = input->queryOutputMeta()->querySerializedDiskMeta();
    if (grouped)
        groupedMeta.setown(createDeltaRecordSize(groupedMeta, +1));
    blockcompressed = checkWriteIsCompressed(helper.getFlags(), serializedOutputMeta.getFixedSize(), grouped);//TDWnewcompress for new compression, else check for row compression
    void *ekey;
    size32_t ekeylen;
    helper.getEncryptKey(ekeylen,ekey);
    encrypted = false;
    Owned<ICompressor> ecomp;
    if (ekeylen!=0)
    {
        ecomp.setown(createAESCompressor256(ekeylen,ekey));
        memset(ekey,0,ekeylen);
        rtlFree(ekey);
        encrypted = true;
        blockcompressed = true;
    }
    if(blockcompressed)
        io.setown(createCompressedFileWriter(file, groupedMeta->getFixedSize(), extend, true, ecomp, COMPRESS_METHOD_LZW));
    else
        io.setown(file->open(extend ? IFOwrite : IFOcreate));
    if(!io)
        throw MakeStringException(errno, "Failed to create%s file %s for writing", (encrypted ? " encrypted" : (blockcompressed ? " compressed" : "")), filename.get());
    incomplete = true;

    diskout.setown(createBufferedIOStream(io));
    if(extend)
        diskout->seek(0, IFSend);

    unsigned rwFlags = rw_autoflush;
    if (grouped)
        rwFlags |= rw_grouped;
    if (true) // MORE: Should this be controlled by an activity hint/flag?
        rwFlags |= rw_crc;
    IExtRowWriter * writer = createRowWriter(diskout, rowIf, rwFlags);
    outSeq.setown(writer);

}


const void * CHThorDiskWriteActivity::getNext()
{   // through operation (writes and returns row)
    // needs a one row lookahead to preserve group
    if (!nextrow.get()) 
    {
        nextrow.setown(input->nextRow());
        if (!nextrow.get())
        {
            nextrow.setown(input->nextRow());
            if (nextrow.get()&&grouped)  // only write eog if not at eof
                outSeq->putRow(NULL);
            return NULL;
        }
    }
    outSeq->putRow(nextrow.getLink());
    checkSizeLimit();
    return nextrow.getClear();
}

bool CHThorDiskWriteActivity::next()
{
    if (!nextrow.get())
    {
        OwnedConstRoxieRow row(input->nextRow());
        if (!row.get()) 
        {
            row.setown(input->nextRow());
            if (!row.get())
                return false; // we are done        
            if (grouped)
                outSeq->putRow(NULL);
        }
        outSeq->putRow(row.getClear());
    }
    else
        outSeq->putRow(nextrow.getClear());
    checkSizeLimit();
    return true;
}


void CHThorDiskWriteActivity::finishOutput()
{
}


void CHThorDiskWriteActivity::close()
{
    diskout.clear();
    outSeq.clear();
    if (io)
    {
        io->flush();
        numDiskWrites = io->getStatistic(StNumDiskWrites);
        io.clear();
    }
    if(clusterHandler)
        clusterHandler->copyPhysical(file, agent.queryWorkUnit()->getDebugValueBool("__output_cluster_no_copy_physical", false));
}

void CHThorDiskWriteActivity::publish()
{
    StringBuffer dir,base;
    offset_t fileSize = file->size();
    if(clusterHandler)
        clusterHandler->getDirAndFilename(dir, base);
    else
        splitFilename(filename, &dir, &dir, &base, &base);

    Owned<IFileDescriptor> desc = createFileDescriptor();
    desc->setDefaultDir(dir.str());

    Owned<IPropertyTree> attrs;
    if(clusterHandler)
        attrs.setown(createPTree("Part")); // clusterHandler is going to set attributes
    else
    {
        // add cluster
        StringBuffer mygroupname;
        Owned<IGroup> mygrp;
        if (isContainerized())
        {
            queryNamedGroupStore().getNasGroupName(mygroupname, 1);
            mygrp.setown(queryNamedGroupStore().lookup(mygroupname));
        }
        else
        {
            if (!agent.queryResolveFilesLocally())
                mygrp.setown(agent.getHThorGroup(mygroupname));
        }
        ClusterPartDiskMapSpec partmap; // will get this from group at some point
        desc->setNumParts(1);
        desc->setPartMask(base.str());
        desc->addCluster(mygroupname.str(),mygrp, partmap);
        attrs.set(&desc->queryPart(0)->queryProperties());
    }
    //properties of the first file part.
    if(blockcompressed)
    {
        attrs->setPropInt64("@size", uncompressedBytesWritten);
        attrs->setPropInt64("@compressedSize", fileSize);
    }
    else
        attrs->setPropInt64("@size", fileSize);
    attrs->setPropInt64("@recordCount", numRecords);
    CDateTime createTime, modifiedTime, accessedTime;
    file->getTime(&createTime, &modifiedTime, &accessedTime);
    // round file time down to nearest sec. Nanosec accurancy is not preserved elsewhere and can lead to mismatch later.
    unsigned hour, min, sec, nanosec;
    modifiedTime.getTime(hour, min, sec, nanosec);
    modifiedTime.setTime(hour, min, sec, 0);
    StringBuffer timestr;
    modifiedTime.getString(timestr);
    if(timestr.length())
        attrs->setProp("@modified", timestr.str());
    if(clusterHandler)
        clusterHandler->setDescriptorParts(desc, base.str(), attrs);

    // properties of the logical file
    IPropertyTree & properties = desc->queryProperties();
    properties.setPropInt64("@size", (blockcompressed) ? uncompressedBytesWritten : fileSize);
    if (encrypted)
        properties.setPropBool("@encrypted", true);
    if (blockcompressed)
        properties.setPropBool("@blockCompressed", true);
    if (helper.getFlags() & TDWpersist)
        properties.setPropBool("@persistent", true);
    if (grouped)
        properties.setPropBool("@grouped", true);
    properties.setPropInt64("@recordCount", numRecords);
    properties.setProp("@owner", agent.queryWorkUnit()->queryUser());
    if (helper.getFlags() & (TDWowned|TDXjobtemp|TDXtemporary))
        properties.setPropBool("@owned", true);
    if (helper.getFlags() & TDWresult)
        properties.setPropBool("@result", true);

    properties.setProp("@workunit", agent.queryWorkUnit()->queryWuid());
    properties.setProp("@job", agent.queryWorkUnit()->queryJobName());
    setFormat(desc);

    if (helper.getFlags() & TDWexpires)
        setExpiryTime(properties, helper.getExpiryDays());
    if (helper.getFlags() & TDWupdate)
    {
        unsigned eclCRC;
        unsigned __int64 totalCRC;
        helper.getUpdateCRCs(eclCRC, totalCRC);
        properties.setPropInt("@eclCRC", eclCRC);
        properties.setPropInt64("@totalCRC", totalCRC);
    }
    properties.setPropInt("@formatCrc", helper.getFormatCrc());
    if (helper.getFlags() & TDWrestricted)
        properties.setPropBool("restricted", true);

    properties.setPropInt64("@numDiskWrites", numDiskWrites);
    StringBuffer lfn;
    expandLogicalFilename(lfn, mangledHelperFileName.str(), agent.queryWorkUnit(), agent.queryResolveFilesLocally(), false);
    CDfsLogicalFileName logicalName;
    if (agent.queryResolveFilesLocally())
        logicalName.allowOsPath(true);
    if (!logicalName.setValidate(lfn.str()))
        throw MakeStringException(99, "Cannot publish %s, invalid logical name", lfn.str());
    if (!logicalName.isExternal()) // no need to publish externals
    {
        Owned<IDistributedFile> file = queryDistributedFileDirectory().createNew(desc);
        if(file->getModificationTime(modifiedTime))
            file->setAccessedTime(modifiedTime);
        if ((helper.getFlags() & TDXtemporary) == 0)
        {
            StringBuffer clusterName;
            file->getClusterName(0, clusterName);
            diskAccessCost = money2cost_type(calcFileAccessCost(clusterName, numDiskWrites, 0));
        }
        file->attach(logicalName.get(), agent.queryCodeContext()->queryUserDescriptor());
        agent.logFileAccess(file, "HThor", "CREATED", graph);
    }
}

void CHThorDiskWriteActivity::updateProgress(IStatisticGatherer &progress) const
{
    CHThorActivityBase::updateProgress(progress);
    StatsActivityScope scope(progress, activityId);
    progress.addStatistic(StNumDiskWrites, numDiskWrites);
    if ((helper.getFlags() & TDXtemporary) == 0)
        progress.addStatistic(StCostFileAccess, diskAccessCost);
}

void CHThorDiskWriteActivity::updateWorkUnitResult(unsigned __int64 reccount)
{
    if(lfn.length()) //this is required as long as temp files don't get a name which can be stored in the WU and automatically deleted by the WU
    {
        WorkunitUpdate wu = agent.updateWorkUnit();
        StringArray clusters;
        if (clusterHandler)
            clusterHandler->getClusters(clusters);
        else
            clusters.append(wu->queryClusterName());
        unsigned flags = helper.getFlags();
        if (!agent.queryResolveFilesLocally())
        {
            WUFileKind fileKind;
            if (TDXtemporary & flags)
                fileKind = WUFileTemporary;
            else if(TDXjobtemp & flags)
                fileKind = WUFileJobOwned;
            else if(TDWowned & flags)
                fileKind = WUFileOwned;
            else
                fileKind = WUFileStandard;
            wu->addFile(lfn.str(), &clusters, helper.getTempUsageCount(), fileKind, NULL);
        }
        else if ((TDXtemporary | TDXjobtemp) & flags)
            agent.noteTemporaryFilespec(filename);//note for later deletion
        if (!(flags & TDXtemporary) && helper.getSequence() >= 0)
        {
            Owned<IWUResult> result = wu->updateResultBySequence(helper.getSequence());
            if (result)
            {
                result->setResultTotalRowCount(reccount);
                result->setResultStatus(ResultStatusCalculated);
                if (helper.getFlags() & TDWresult)
                    result->setResultFilename(lfn.str());
                else
                    result->setResultLogicalName(lfn.str());
            }
        }
    }
}

void CHThorDiskWriteActivity::setFormat(IFileDescriptor * desc)
{
    if ((serializedOutputMeta.isFixedSize()) && !isOutputTransformed())
        desc->queryProperties().setPropInt("@recordSize", serializedOutputMeta.getFixedSize() + (grouped ? 1 : 0));

    const char *recordECL = helper.queryRecordECL();
    if (recordECL && *recordECL)
        desc->queryProperties().setProp("ECL", recordECL);

    setRtlFormat(desc->queryProperties(), helper.queryDiskRecordSize());
    desc->queryProperties().setProp("@kind", "flat");
}

void CHThorDiskWriteActivity::checkSizeLimit()
{
    if(sizeLimit && outSeq && (outSeq->getPosition() > sizeLimit))
    {
        StringBuffer msg;
        msg.append("Exceeded disk write size limit of ").append(sizeLimit).append(" while writing file ").append(mangledHelperFileName.str());
        throw MakeStringExceptionDirect(0, msg.str());
    }
}

//=====================================================================================================

CHThorSpillActivity::CHThorSpillActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorSpillArg &_arg, ThorActivityKind _kind, EclGraph & _graph) : CHThorDiskWriteActivity(_agent, _activityId, _subgraphId, _arg, _kind, _graph)
{
}

void CHThorSpillActivity::setInput(unsigned index, IHThorInput *_input)
{
    CHThorActivityBase::setInput(index, _input);

}

void CHThorSpillActivity::ready()
{
    CHThorDiskWriteActivity::ready();
}

void CHThorSpillActivity::execute()
{
    UNIMPLEMENTED;
}

const void *CHThorSpillActivity::nextRow()
{
    const void *nextrec = getNext();
    if (nextrec)
    {
        numRecords++;
        processed++;
    }
    return nextrec;
}

void CHThorSpillActivity::stop()
{
    for (;;)
    {
        OwnedConstRoxieRow nextrec(nextRow());
        if (!nextrec) 
        {
            nextrec.setown(nextRow());
            if (!nextrec)
                break;
        }   
    }
    finishOutput();
    CHThorDiskWriteActivity::stop();
}

//=====================================================================================================


CHThorCsvWriteActivity::CHThorCsvWriteActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorCsvWriteArg &_arg, ThorActivityKind _kind, EclGraph & _graph) : CHThorDiskWriteActivity(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(_arg)
{
    csvOutput.init(helper.queryCsvParameters(),agent.queryWorkUnit()->getDebugValueBool("oldCSVoutputFormat", false));
}

void CHThorCsvWriteActivity::execute()
{
    OwnedRoxieString header(helper.queryCsvParameters()->getHeader());
    if (header) {
        csvOutput.beginLine();
        csvOutput.writeHeaderLn(strlen(header), header);
        diskout->write(csvOutput.length(), csvOutput.str());
    }

    // Loop thru the results
    numRecords = 0;
    for (;;)
    {
        OwnedConstRoxieRow nextrec(input->nextRow());
        if (!nextrec)
        {
            nextrec.setown(input->nextRow());
            if (!nextrec)
                break;
        }

        try
        {
            csvOutput.beginLine();
            helper.writeRow((const byte *)nextrec.get(), &csvOutput);
            csvOutput.endLine();
        }
        catch(IException * e)
        {
            throw makeWrappedException(e);
        }
        diskout->write(csvOutput.length(), csvOutput.str());
        numRecords++;
    }

    OwnedRoxieString footer(helper.queryCsvParameters()->getFooter());
    if (footer) {
        csvOutput.beginLine();
        csvOutput.writeHeaderLn(strlen(footer), footer);
        diskout->write(csvOutput.length(), csvOutput.str());
    }
}

void CHThorCsvWriteActivity::setFormat(IFileDescriptor * desc)
{
    // MORE - should call parent's setFormat too?
    ICsvParameters * csvInfo = helper.queryCsvParameters();
    OwnedRoxieString rs(csvInfo->getSeparator(0));
    StringBuffer separator;
    const char *s = rs;
    while (s && *s)
    {
        if (',' == *s)
            separator.append("\\,");
        else
            separator.append(*s);
        ++s;
    }
    desc->queryProperties().setProp("@csvSeparate", separator.str());
    desc->queryProperties().setProp("@csvQuote", rs.setown(csvInfo->getQuote(0)));
    desc->queryProperties().setProp("@csvTerminate", rs.setown(csvInfo->getTerminator(0)));
    desc->queryProperties().setProp("@csvEscape", rs.setown(csvInfo->getEscape(0)));
    desc->queryProperties().setProp("@format","utf8n");
    desc->queryProperties().setProp("@kind", "csv");
    const char *recordECL = helper.queryRecordECL();
    if (recordECL && *recordECL)
        desc->queryProperties().setProp("ECL", recordECL);
    setRtlFormat(desc->queryProperties(), helper.queryDiskRecordSize());
}

//=====================================================================================================

CHThorXmlWriteActivity::CHThorXmlWriteActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorXmlWriteArg &_arg, ThorActivityKind _kind, EclGraph & _graph) : CHThorDiskWriteActivity(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(_arg), headerLength(0), footerLength(0)
{
    OwnedRoxieString xmlpath(helper.getXmlIteratorPath());
    if (!xmlpath)
        rowTag.append(DEFAULTXMLROWTAG);
    else
    {
        const char *path = xmlpath;
        if (*path == '/') path++;
        if (strchr(path, '/')) UNIMPLEMENTED;               // more what do we do with /mydata/row
        rowTag.append(path);
    }
}

void CHThorXmlWriteActivity::execute()
{
    // Loop thru the results
    numRecords = 0;
    StringBuffer header;
    OwnedRoxieString suppliedHeader(helper.getHeader());
    if (kind==TAKjsonwrite)
        buildJsonHeader(header, suppliedHeader, rowTag);
    else if (suppliedHeader)
        header.set(suppliedHeader);
    else
        header.append(DEFAULTXMLHEADER).newline();

    headerLength = header.length();
    diskout->write(headerLength, header.str());

    Owned<IXmlWriterExt> writer = createIXmlWriterExt(helper.getXmlFlags(), 0, NULL, (kind==TAKjsonwrite) ? WTJSONRootless : WTStandard);
    writer->outputBeginArray(rowTag); //need to set up the array
    writer->clear(); //but not output it

    for (;;)
    {
        OwnedConstRoxieRow nextrec(input->nextRow());
        if (!nextrec)
        {
            nextrec.setown(input->nextRow());
            if (!nextrec)
                break;
        }

        try
        {
            writer->clear().outputBeginNested(rowTag, false);
            helper.toXML((const byte *)nextrec.get(), *writer);
            writer->outputEndNested(rowTag);
        }
        catch(IException * e)
        {
            throw makeWrappedException(e);
        }

        diskout->write(writer->length(), writer->str());
        numRecords++;
    }

    OwnedRoxieString suppliedFooter(helper.getFooter());
    StringBuffer footer;
    if (kind==TAKjsonwrite)
        buildJsonFooter(footer.newline(), suppliedFooter, rowTag);
    else if (suppliedFooter)
        footer.append(suppliedFooter);
    else
        footer.append(DEFAULTXMLFOOTER).newline();

    footerLength=footer.length();
    diskout->write(footerLength, footer);
}

void CHThorXmlWriteActivity::setFormat(IFileDescriptor * desc)
{
    desc->queryProperties().setProp("@format","utf8n");
    desc->queryProperties().setProp("@rowTag",rowTag.str());
    desc->queryProperties().setProp("@kind", (kind==TAKjsonwrite) ? "json" : "xml");

    desc->queryProperties().setPropInt(FPheaderLength, headerLength);
    desc->queryProperties().setPropInt(FPfooterLength, footerLength);

    const char *recordECL = helper.queryRecordECL();
    if (recordECL && *recordECL)
        desc->queryProperties().setProp("ECL", recordECL);
    setRtlFormat(desc->queryProperties(), helper.queryDiskRecordSize());
}

//=====================================================================================================

void throwPipeProcessError(unsigned err, char const * preposition, char const * program, IPipeProcess * pipe)
{
    StringBuffer msg;
    msg.append("Error piping ").append(preposition).append(" (").append(program).append("): ");
    if (START_FAILURE == err) // PIPE process didn't start at all, START_FAILURE is our own error code
        msg.append("process failed to start");
    else
        msg.append("process failed with code ").append(err);
    if(pipe->hasError())
    {
        try
        {
            char error[512];
            size32_t sz = pipe->readError(sizeof(error), error);
            if(sz && sz!=(size32_t)-1)
                msg.append(", stderr: '").append(sz, error).append("'");
        }
        catch (IException *e)
        {
            EXCLOG(e, "Error reading pipe stderr");
            e->Release();
        }
    }
    throw MakeStringExceptionDirect(2, msg.str());
}

//=====================================================================================================

CHThorIndexWriteActivity::CHThorIndexWriteActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorIndexWriteArg &_arg, ThorActivityKind _kind, EclGraph & _graph) : CHThorActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(_arg)
{
    incomplete = false;
    StringBuffer lfn;
    OwnedRoxieString fname(helper.getFileName());
    expandLogicalFilename(lfn, fname, agent.queryWorkUnit(), agent.queryResolveFilesLocally(), false);
    if (!agent.queryResolveFilesLocally())
    {
        Owned<IDistributedFile> f = wsdfs::lookup(lfn, agent.queryCodeContext()->queryUserDescriptor(), AccessMode::tbdWrite, false, false, nullptr, defaultNonPrivilegedUser, INFINITE);

        if (f)
        {
            if (TIWoverwrite & helper.getFlags()) 
            {
                LOG(MCuserInfo, "Removing %s from DFS", lfn.str());
                agent.logFileAccess(f, "HThor", "DELETED", _graph);
                f->detach();
            }
            else // not quite sure about raising exceptions in constructors
                throw MakeStringException(99, "Cannot write %s, file already exists (missing OVERWRITE attribute?)", lfn.str());
        }
    }
    clusterHandler.setown(createClusterWriteHandler(agent, &helper, NULL, lfn, filename, false));
    sizeLimit = agent.queryWorkUnit()->getDebugValueInt64("hthorDiskWriteSizeLimit", defaultHThorDiskWriteSizeLimit);
    defaultNoSeek = agent.queryWorkUnit()->getDebugValueBool("noSeekBuildIndex", isContainerized());
}

CHThorIndexWriteActivity::~CHThorIndexWriteActivity()
{
    if(incomplete)
    {
        PROGLOG("Index write incomplete, deleting physical file: %s", filename.get());
        file->remove();
    }
}

void CHThorIndexWriteActivity::execute()
{
    size32_t maxDiskRecordSize;
    if (helper.queryDiskRecordSize()->isVariableSize())
    {
        if (helper.getFlags() & TIWmaxlength)
            maxDiskRecordSize = helper.getMaxKeySize();
        else
            maxDiskRecordSize = KEYBUILD_MAXLENGTH; // Current default behaviour, could be improved in the future
    }
    else
        maxDiskRecordSize = helper.queryDiskRecordSize()->getFixedSize();

    if (maxDiskRecordSize > KEYBUILD_MAXLENGTH)
        throw MakeStringException(99, "Index maximum record length (%d) exceeds 32K internal limit", maxDiskRecordSize);

    OwnedMalloc<char> rowBuffer(maxDiskRecordSize, true);

    // Loop thru the results
    unsigned __int64 reccount = 0;
    unsigned int fileCrc = -1;
    file.setown(createIFile(filename.get()));
    {
        OwnedIFileIO io;
        try
        {
            io.setown(file->open(IFOcreate));
        }
        catch(IException * e)
        {
            e->Release();
            clearKeyStoreCache(false);
            io.setown(file->open(IFOcreate));
        }
        incomplete = true;
        bool needsSeek = true;
        bool isVariable = helper.queryDiskRecordSize()->isVariableSize();
        unsigned flags = COL_PREFIX | HTREE_FULLSORT_KEY;
        if (helper.getFlags() & TIWrowcompress)
            flags |= HTREE_COMPRESSED_KEY|HTREE_QUICK_COMPRESSED_KEY;
        else if (!(helper.getFlags() & TIWnolzwcompress))
            flags |= HTREE_COMPRESSED_KEY;
        if (isVariable)
            flags |= HTREE_VARSIZE;
        Owned<IPropertyTree> metadata;
        buildUserMetadata(metadata);
        buildLayoutMetadata(metadata);
        unsigned nodeSize = metadata->getPropInt("_nodeSize", NODESIZE);
        if (metadata->getPropBool("_noSeek", defaultNoSeek))
        {
            flags |= TRAILING_HEADER_ONLY;
            needsSeek = false;
        }
        if (metadata->getPropBool("_useTrailingHeader", true))
            flags |= USE_TRAILING_HEADER;

        size32_t keyMaxSize = helper.queryDiskRecordSize()->getRecordSize(NULL);
        if (hasTrailingFileposition(helper.queryDiskRecordSize()->queryTypeInfo()))
            keyMaxSize -= sizeof(offset_t);

        Owned<IFileIOStream> out = createBufferedIOStream(io, 0x100000);
        if (!needsSeek)
            out.setown(createNoSeekIOStream(out));

        Owned<IKeyBuilder> builder = createKeyBuilder(out, flags, keyMaxSize, nodeSize, helper.getKeyedSize(), 0, &helper, true, false);
        class BcWrapper : implements IBlobCreator
        {
            IKeyBuilder *builder;
        public:
            BcWrapper(IKeyBuilder *_builder) : builder(_builder) {}
            virtual unsigned __int64 createBlob(size32_t size, const void * ptr)
            {
                return builder->createBlob(size, (const char *) ptr);
            }
        } bc(builder);
        for (;;)
        {
            OwnedConstRoxieRow nextrec(input->nextRow());
            if (!nextrec)
            {
                nextrec.setown(input->nextRow());
                if (!nextrec)
                    break;
            }
            try
            {
                unsigned __int64 fpos;
                RtlStaticRowBuilder rowBuilder(rowBuffer, maxDiskRecordSize);
                size32_t thisSize = helper.transform(rowBuilder, nextrec, &bc, fpos);
                builder->processKeyData(rowBuffer, fpos, thisSize);
            }
            catch(IException * e)
            {
                throw makeWrappedException(e);
            }
            if(sizeLimit && (out->tell() > sizeLimit))
            {
                StringBuffer msg;
                OwnedRoxieString fname(helper.getFileName());
                msg.append("Exceeded disk write size limit of ").append(sizeLimit).append(" while writing index ").append(fname);
                throw MakeStringExceptionDirect(0, msg.str());
            }
            reccount++;
        }
        builder->finish(metadata, &fileCrc);
        duplicateKeyCount = builder->getDuplicateCount();
        cummulativeDuplicateKeyCount += duplicateKeyCount;
        numDiskWrites = io->getStatistic(StNumDiskWrites);
        out->flush();
        out.clear();
    }

    if(clusterHandler)
        clusterHandler->copyPhysical(file, agent.queryWorkUnit()->getDebugValueBool("__output_cluster_no_copy_physical", false));
    clearKeyStoreCacheEntry(file->queryFilename());

    // Now publish to name services
    StringBuffer dir,base;
    offset_t indexFileSize = file->size();
    if(clusterHandler)
        clusterHandler->getDirAndFilename(dir, base);
    else
        splitFilename(filename, &dir, &dir, &base, &base);

    Owned<IFileDescriptor> desc = createFileDescriptor();
    desc->setDefaultDir(dir.str());

    //properties of the first file part.
    Owned<IPropertyTree> attrs;
    if(clusterHandler)
        attrs.setown(createPTree("Part"));  // clusterHandler is going to set attributes
    else
    {
        // add cluster
        StringBuffer mygroupname;
        Owned<IGroup> mygrp = NULL;
        if (isContainerized())
        {
            queryNamedGroupStore().getNasGroupName(mygroupname, 1);
            mygrp.setown(queryNamedGroupStore().lookup(mygroupname));
        }
        else
        {
            if (!agent.queryResolveFilesLocally())
                mygrp.setown(agent.getHThorGroup(mygroupname));
        }
        ClusterPartDiskMapSpec partmap; // will get this from group at some point
        desc->setNumParts(1);
        desc->setPartMask(base.str());
        desc->addCluster(mygroupname.str(),mygrp, partmap);
        attrs.set(&desc->queryPart(0)->queryProperties());
    }
    attrs->setPropInt64("@size", indexFileSize);
    attrs->setPropInt64("@recordCount", reccount);

    CDateTime createTime, modifiedTime, accessedTime;
    file->getTime(&createTime, &modifiedTime, &accessedTime);
    // round file time down to nearest sec. Nanosec accurancy is not preserved elsewhere and can lead to mismatch later.
    unsigned hour, min, sec, nanosec;
    modifiedTime.getTime(hour, min, sec, nanosec);
    modifiedTime.setTime(hour, min, sec, 0);
    StringBuffer timestr;
    modifiedTime.getString(timestr);
    if(timestr.length())
        attrs->setProp("@modified", timestr.str());

    if(clusterHandler)
        clusterHandler->setDescriptorParts(desc, base.str(), attrs);

    // properties of the logical file
    IPropertyTree & properties = desc->queryProperties();
    properties.setProp("@kind", "key");
    properties.setPropInt64("@size", indexFileSize);
    properties.setPropInt64("@recordCount", reccount);
    properties.setProp("@owner", agent.queryWorkUnit()->queryUser());
    properties.setProp("@workunit", agent.queryWorkUnit()->queryWuid());
    properties.setProp("@job", agent.queryWorkUnit()->queryJobName());
    properties.setPropInt64("@duplicateKeyCount",duplicateKeyCount);
    properties.setPropInt64("@numDiskWrites", numDiskWrites);

    char const * rececl = helper.queryRecordECL();
    if(rececl && *rececl)
        properties.setProp("ECL", rececl);

    if (helper.getFlags() & TIWexpires)
        setExpiryTime(properties, helper.getExpiryDays());
    if (helper.getFlags() & TIWupdate)
    {
        unsigned eclCRC;
        unsigned __int64 totalCRC;
        helper.getUpdateCRCs(eclCRC, totalCRC);
        properties.setPropInt("@eclCRC", eclCRC);
        properties.setPropInt64("@totalCRC", totalCRC);
    }

    properties.setPropInt("@fileCrc", fileCrc);
    properties.setPropInt("@formatCrc", helper.getFormatCrc());
    // Legacy record layout info
    void * layoutMetaBuff;
    size32_t layoutMetaSize;
    if(helper.getIndexLayout(layoutMetaSize, layoutMetaBuff))
    {
        properties.setPropBin("_record_layout", layoutMetaSize, layoutMetaBuff);
        rtlFree(layoutMetaBuff);
    }
    if (helper.getFlags() & TIWrestricted)
        properties.setPropBool("restricted", true);
    // New record layout info
    setRtlFormat(properties, helper.queryDiskRecordSize());
    // Bloom info
    const IBloomBuilderInfo * const *bloomFilters = helper.queryBloomInfo();
    while (bloomFilters && *bloomFilters)
    {
        const IBloomBuilderInfo *info = *bloomFilters++;
        IPropertyTree *bloom = properties.addPropTree("Bloom");
        bloom->setPropInt64("@bloomFieldMask", info->getBloomFields());
        bloom->setPropInt64("@bloomLimit", info->getBloomLimit());  // MORE - if we didn't actually build because of the limit that might be interesting. Though that's going to vary by part.
        VStringBuffer pval("%f", info->getBloomProbability());
        bloom->setProp("@bloomProbability", pval.str());
    }

    StringBuffer lfn;
    Owned<IDistributedFile> dfile = NULL;
    if (!agent.queryResolveFilesLocally())
    {
        dfile.setown(queryDistributedFileDirectory().createNew(desc));
        OwnedRoxieString fname(helper.getFileName());
        expandLogicalFilename(lfn, fname, agent.queryWorkUnit(), agent.queryResolveFilesLocally(), false);
        dfile->attach(lfn.str(),agent.queryCodeContext()->queryUserDescriptor());
        agent.logFileAccess(dfile, "HThor", "CREATED", graph);

        StringBuffer clusterName;
        dfile->getClusterName(0, clusterName);
        diskAccessCost = money2cost_type(calcFileAccessCost(clusterName, numDiskWrites, 0));
    }
    else
        lfn = filename;

    incomplete = false;

    if(clusterHandler)
        clusterHandler->finish(file);

    // and update wu info
    if (helper.getSequence() >= 0)
    {
        WorkunitUpdate wu = agent.updateWorkUnit();
        Owned<IWUResult> result = wu->updateResultBySequence(helper.getSequence());
        if (result)
        {
            result->setResultTotalRowCount(reccount); 
            result->setResultStatus(ResultStatusCalculated);
            result->setResultLogicalName(lfn.str());
        }
    }
}

void CHThorIndexWriteActivity::buildUserMetadata(Owned<IPropertyTree> & metadata)
{
    size32_t nameLen;
    char * nameBuff;
    size32_t valueLen;
    char * valueBuff;
    unsigned idx = 0;
    while(helper.getIndexMeta(nameLen, nameBuff, valueLen, valueBuff, idx++))
    {
        StringBuffer name(nameLen, nameBuff);
        StringBuffer value(valueLen, valueBuff);
        if(*nameBuff == '_' && !checkReservedMetadataName(name))
        {
            OwnedRoxieString fname(helper.getFileName());
            throw MakeStringException(0, "Invalid name %s in user metadata for index %s (names beginning with underscore are reserved)", name.str(), fname.get());
        }
        if(!validateXMLTag(name.str()))
        {
            OwnedRoxieString fname(helper.getFileName());
            throw MakeStringException(0, "Invalid name %s in user metadata for index %s (not legal XML element name)", name.str(), fname.get());
        }
        if(!metadata) metadata.setown(createPTree("metadata"));
        metadata->setProp(name.str(), value.str());
    }
}

void CHThorIndexWriteActivity::buildLayoutMetadata(Owned<IPropertyTree> & metadata)
{
    if(!metadata) metadata.setown(createPTree("metadata"));
    metadata->setProp("_record_ECL", helper.queryRecordECL());

    setRtlFormat(*metadata, helper.queryDiskRecordSize());
}

//=====================================================================================================

class CHThorPipeReadActivity : public CHThorSimpleActivityBase
{
    IHThorPipeReadArg &helper;
    Owned<IPipeProcess> pipe;
    StringAttr pipeCommand;
    Owned<IOutputRowDeserializer> rowDeserializer;
    Owned<IReadRowStream> readTransformer;
    bool groupSignalled;
public:
    CHThorPipeReadActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorPipeReadArg &_arg, ThorActivityKind _kind, EclGraph & _graph)
        : CHThorSimpleActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(_arg)
    {
        groupSignalled = true;
    }

    virtual bool needsAllocator() const { return true; }

    virtual void ready()
    {
        groupSignalled = true; // i.e. don't start with a NULL row
        CHThorSimpleActivityBase::ready();
        rowDeserializer.setown(rowAllocator->createDiskDeserializer(agent.queryCodeContext()));
        OwnedRoxieString xmlIteratorPath(helper.getXmlIteratorPath());
        readTransformer.setown(createReadRowStream(rowAllocator, rowDeserializer, helper.queryXmlTransformer(), helper.queryCsvTransformer(), xmlIteratorPath, helper.getPipeFlags()));
        OwnedRoxieString pipeProgram(helper.getPipeProgram());
        openPipe(pipeProgram);
    }

    virtual void stop()
    {
        //Need to close the output (or read it in its entirety), otherwise we might wait forever for the
        //program to finish
        if (pipe)
            pipe->closeOutput();
        pipe.clear();
        readTransformer->setStream(NULL);
        CHThorSimpleActivityBase::stop();
    }

    virtual const void *nextRow()
    {
        while (!waitForPipe())
        {
            if (!pipe)
                return NULL;
            if (helper.getPipeFlags() & TPFgroupeachrow)
            {
                if (!groupSignalled)
                {
                    groupSignalled = true;
                    return NULL;
                }
            }
        }
        const void *ret = readTransformer->next();
        assertex(ret != NULL); // if ret can ever be NULL then we need to recode this logic
        processed++;
        groupSignalled = false;
        return ret;
    }

protected:
    bool waitForPipe()
    {
        if (!pipe)
            return false;  // done
        if (!readTransformer->eos())
            return true;
        verifyPipe();
        return false;
    }

    void openPipe(char const * cmd)
    {
        pipeCommand.setown(cmd);
        pipe.setown(createPipeProcess(agent.queryAllowedPipePrograms()));
        if(!pipe->run(NULL, cmd, ".", false, true, true, 0x10000))
        {
            // NB: pipe->run can't rely on the child process failing fast enough to return false here, failure picked up later with stderr context.
            WARNLOG(2, "Could not run pipe process %s", cmd);
        }
        Owned<ISimpleReadStream> pipeReader = pipe->getOutputStream();
        readTransformer->setStream(pipeReader.get());
    }

    void verifyPipe()
    {
        if (pipe)
        {
            unsigned err = pipe->wait();
            if(err && !(helper.getPipeFlags() & TPFnofail))
                throwPipeProcessError(err, "from", pipeCommand.get(), pipe);
            pipe.clear();
        }
    }
};

//=====================================================================================================

// Through pipe code - taken from Roxie implementation

interface IPipeRecordPullerCallback : extends IExceptionHandler
{
    virtual void processRow(const void *row) = 0;
    virtual void processDone() = 0;
    virtual const void *nextInput() = 0;
};

class CPipeRecordPullerThread : public Thread
{
protected:
    IPipeRecordPullerCallback *helper;
    bool eog;

public:
    CPipeRecordPullerThread() : Thread("PipeRecordPullerThread")
    {
        helper = NULL;
        eog = false;
    }

    void setInput(IPipeRecordPullerCallback *_helper)
    {
        helper = _helper;
    }

    virtual int run()
    {
        try
        {
            for (;;)
            {
                const void * row = helper->nextInput();
                if (row)
                {
                    eog = false;
                    helper->processRow(row);
                }
                else if (!eog)
                {
                    eog = true;
                }
                else
                {
                    break;
                }
            }
            helper->processDone();
        }
        catch (IException *e)
        {
            helper->fireException(e);
        }
        catch (...)
        {
            helper->fireException(MakeStringException(2, "Unexpected exception caught in PipeRecordPullerThread::run"));
        }
        return 0;
    }
};

class CHThorPipeThroughActivity : public CHThorSimpleActivityBase, implements IPipeRecordPullerCallback
{
    IHThorPipeThroughArg &helper;
    CPipeRecordPullerThread puller;
    Owned<IPipeProcess> pipe;
    StringAttr pipeCommand;
    InterruptableSemaphore pipeVerified;
    InterruptableSemaphore pipeOpened;
    CachedOutputMetaData inputMeta;
    Owned<IOutputRowSerializer> rowSerializer;
    Owned<IOutputRowDeserializer> rowDeserializer;
    Owned<IPipeWriteXformHelper> writeTransformer;
    Owned<IReadRowStream> readTransformer;
    bool firstRead;
    bool recreate;
    bool inputExhausted;
    bool groupSignalled;

public:
    CHThorPipeThroughActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorPipeThroughArg &_arg, ThorActivityKind _kind, EclGraph & _graph)
        : CHThorSimpleActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(_arg)
    {
        recreate = helper.recreateEachRow();
        groupSignalled = true;
        firstRead = false;
        inputExhausted = false;
        puller.setInput(this);
    }

    virtual void ready()
    {
        CHThorSimpleActivityBase::ready();
        // From the create() in roxie

        inputMeta.set(input->queryOutputMeta());
        rowSerializer.setown(inputMeta.createDiskSerializer(agent.queryCodeContext(), activityId));
        rowDeserializer.setown(rowAllocator->createDiskDeserializer(agent.queryCodeContext()));
        writeTransformer.setown(createPipeWriteXformHelper(helper.getPipeFlags(), helper.queryXmlOutput(), helper.queryCsvOutput(), rowSerializer));

        // From the start() in roxie
        firstRead = true;
        inputExhausted = false;
        groupSignalled = true; // i.e. don't start with a NULL row
        pipeVerified.reinit();
        pipeOpened.reinit();
        writeTransformer->ready();

        if (!readTransformer)
        {
            OwnedRoxieString xmlIterator(helper.getXmlIteratorPath());
            readTransformer.setown(createReadRowStream(rowAllocator, rowDeserializer, helper.queryXmlTransformer(), helper.queryCsvTransformer(), xmlIterator, helper.getPipeFlags()));
        }
        if(!recreate)
        {
            OwnedRoxieString pipeProgram(helper.getPipeProgram());
            openPipe(pipeProgram);
        }
        puller.start();
    }

    void stop()
    {
        //Need to close the output (or read it in its entirety), otherwise we might wait forever for the
        //program to finish
        if (pipe)
            pipe->closeOutput();
        pipeVerified.interrupt(NULL);
        pipeOpened.interrupt(NULL);
        puller.join();
        CHThorSimpleActivityBase::stop();
        pipe.clear();
        readTransformer->setStream(NULL);
    }

    virtual bool needsAllocator() const { return true; }

    virtual const void *nextRow()
    {
        while (!waitForPipe())
        {
            if (!pipe)
                return NULL;
            if (helper.getPipeFlags() & TPFgroupeachrow)
            {
                if (!groupSignalled)
                {
                    groupSignalled = true;
                    return NULL;
                }
            }
        }
        const void *ret = readTransformer->next();
        assertex(ret != NULL); // if ret can ever be NULL then we need to recode this logic
        processed++;
        groupSignalled = false;
        return ret;
    }

    virtual bool isGrouped()
    {
        return outputMeta.isGrouped();
    }

    virtual void processRow(const void *row)
    {
        // called from puller thread
        if(recreate)
            openPipe(helper.getNameFromRow(row));
        try
        {
            writeTransformer->writeTranslatedText(row, pipe);
        }
        catch (IException *)
        {
            ReleaseRoxieRow(row);
            throw;
        }
        ReleaseRoxieRow(row);
        if(recreate)
        {
            closePipe();
            pipeVerified.wait();
        }
    }

    virtual void processDone()
    {
        // called from puller thread
        if(recreate)
        {
            inputExhausted = true;
            pipeOpened.signal();
        }
        else
        {
            closePipe();
            pipeVerified.wait();
        }
    }

    virtual const void *nextInput()
    {
        return input->nextRow();
    }

    virtual bool fireException(IException *e)
    {
        inputExhausted = true;
        pipeOpened.interrupt(LINK(e));
        pipeVerified.interrupt(e);
        return true;
    }

private:
    bool waitForPipe()
    {
        Owned<IException> pipeException;
        try
        {
            if (firstRead)
            {
                pipeOpened.wait();
                firstRead = false;
            }
            if (!pipe)
                return false;  // done
            if (!readTransformer->eos())
                return true;
        }
        catch (IException *e)
        {
            // NB: the original exception is probably a IPipeProcessException, but because InterruptableSemaphore rethrows it, we must catch it as an IException
            pipeException.setown(e);
        }
        verifyPipe();
        if (pipeException) // NB: verifyPipe may throw error based on pipe prog. output 1st.
            throw pipeException.getClear();
        if (recreate && !inputExhausted)
            pipeOpened.wait();
        return false;
    }
    void openPipe(char const * cmd)
    {
        pipeCommand.setown(cmd);
        pipe.setown(createPipeProcess(agent.queryAllowedPipePrograms()));
        if(!pipe->run(NULL, cmd, ".", true, true, true, 0x10000))
        {
            // NB: pipe->run can't rely on the child process failing fast enough to return false here, failure picked up later with stderr context.
            WARNLOG(2, "Could not run pipe process %s", cmd);
        }
        else
            writeTransformer->writeHeader(pipe);

        Owned<ISimpleReadStream> pipeReader = pipe->getOutputStream();
        readTransformer->setStream(pipeReader.get());
        pipeOpened.signal();
    }

    void closePipe()
    {
        writeTransformer->writeFooter(pipe);
        pipe->closeInput();
    }

    void verifyPipe()
    {
        if (pipe)
        {
            unsigned err = pipe->wait();
            if(err && !(helper.getPipeFlags() & TPFnofail))
                throwPipeProcessError(err, "through", pipeCommand.get(), pipe);
            pipe.clear();
            pipeVerified.signal();
        }
    }
};

class CHThorPipeWriteActivity : public CHThorActivityBase
{
    IHThorPipeWriteArg &helper;
    Owned<IPipeProcess> pipe;
    StringAttr pipeCommand;
    CachedOutputMetaData inputMeta;
    Owned<IOutputRowSerializer> rowSerializer;
    Owned<IPipeWriteXformHelper> writeTransformer;
    bool firstRead;
    bool recreate;
    bool inputExhausted;
public:
    IMPLEMENT_SINKACTIVITY;

    CHThorPipeWriteActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorPipeWriteArg &_arg, ThorActivityKind _kind, EclGraph & _graph)
        : CHThorActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(_arg)
    {
        recreate = helper.recreateEachRow();
        firstRead = false;
        inputExhausted = false;
    }

    virtual bool needsAllocator() const { return true; }

    virtual void ready()
    {
        CHThorActivityBase::ready();
        inputMeta.set(input->queryOutputMeta());
        rowSerializer.setown(inputMeta.createDiskSerializer(agent.queryCodeContext(), activityId));
        writeTransformer.setown(createPipeWriteXformHelper(helper.getPipeFlags(), helper.queryXmlOutput(), helper.queryCsvOutput(), rowSerializer));

        firstRead = true;
        inputExhausted = false;
        writeTransformer->ready();
        if(!recreate)
        {
            OwnedRoxieString pipeProgram(helper.getPipeProgram());
            openPipe(pipeProgram);
        }
    }

    virtual void execute()
    {
        Owned<IException> pipeException;
        try
        {
            for (;;)
            {
                OwnedConstRoxieRow row(input->nextRow());
                if (!row)
                {
                    row.setown(input->nextRow());
                    if (!row)
                        break;
                }
                processed++;
                if (recreate)
                    openPipe(helper.getNameFromRow(row));
                writeTransformer->writeTranslatedText(row, pipe);
                if (recreate)
                {
                    closePipe();
                    verifyPipe();
                }
            }
            if (!recreate)
                closePipe();
        }
        catch (IException *e)
        {
            // NB: the original exception is probably a IPipeProcessException, but because InterruptableSemaphore rethrows it, we must catch it as an IException
            pipeException.setown(e);
        }
        verifyPipe();
        if (pipeException) // NB: verifyPipe may throw error based on pipe prog. output 1st.
            throw pipeException.getClear();
        if (helper.getSequence() >= 0)
        {
            WorkunitUpdate wu = agent.updateWorkUnit();
            Owned<IWUResult> result = wu->updateResultBySequence(helper.getSequence());
            if (result)
            {
                result->setResultTotalRowCount(processed);
                result->setResultStatus(ResultStatusCalculated);
            }
        }
    }

private:
    void openPipe(char const * cmd)
    {
        pipeCommand.setown(cmd);
        pipe.setown(createPipeProcess(agent.queryAllowedPipePrograms()));
        if (!pipe->run(NULL, cmd, ".", true, false, true, 0x10000))
        {
            // NB: pipe->run can't rely on the child process failing fast enough to return false here, failure picked up later with stderr context.
            WARNLOG(2, "Could not run pipe process %s", cmd);
        }
        else
            writeTransformer->writeHeader(pipe);
    }

    void closePipe()
    {
        writeTransformer->writeFooter(pipe);
        pipe->closeInput();
    }

    void verifyPipe()
    {
        if (pipe)
        {
            unsigned err = pipe->wait();
            if(err && !(helper.getPipeFlags() & TPFnofail))
                throwPipeProcessError(err, "to", pipeCommand.get(), pipe);
            pipe.clear();
        }
    }
};

//=====================================================================================================

CHThorIterateActivity::CHThorIterateActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorIterateArg &_arg, ThorActivityKind _kind, EclGraph & _graph) : CHThorSimpleActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(_arg)
{
}

void CHThorIterateActivity::stop()
{
    CHThorSimpleActivityBase::stop();
    right.clear();
    left.clear();
}

void CHThorIterateActivity::ready()
{
    CHThorSimpleActivityBase::ready();
    if (!defaultRecord)
    {
        RtlDynamicRowBuilder rowBuilder(rowAllocator);
        size32_t thisSize = helper.createDefault(rowBuilder);
        defaultRecord.setown(rowBuilder.finalizeRowClear(thisSize));
    }
    counter = 0;
}

const void *CHThorIterateActivity::nextRow()
{
    for (;;)
    {
        right.setown(input->nextRow());
        if(!right)
        {
            bool skippedGroup = (!left) && (counter > 0); //we have just skipped entire group, but shouldn't output a double null
            left.clear();
            counter = 0;
            if(skippedGroup) continue;
            return NULL;
        }
        try
        {
            RtlDynamicRowBuilder rowBuilder(rowAllocator);
            unsigned outSize = helper.transform(rowBuilder, left ? left : defaultRecord, right, ++counter);
            if (outSize)
            {
                left.setown(rowBuilder.finalizeRowClear(outSize));  
                processed++;
                return left.getLink();
            }
        }
        catch(IException * e)
        {
            throw makeWrappedException(e);
        }
    }
}

//=====================================================================================================

CHThorProcessActivity::CHThorProcessActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorProcessArg &_arg, ThorActivityKind _kind, EclGraph & _graph) : CHThorSimpleActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(_arg)
{
}

CHThorProcessActivity::~CHThorProcessActivity()
{
}


void CHThorProcessActivity::ready()
{
    CHThorSimpleActivityBase::ready();
    rightRowAllocator.setown(agent.queryCodeContext()->getRowAllocator( helper.queryRightRecordSize(), activityId));

    RtlDynamicRowBuilder rowBuilder(rightRowAllocator);
    size32_t thisSize = helper.createInitialRight(rowBuilder);
    initialRight.setown(rowBuilder.finalizeRowClear(thisSize));

    curRight.set(initialRight);
    counter = 0;
}

const void *CHThorProcessActivity::nextRow()
{
    try
    {
        for (;;)
        {
            OwnedConstRoxieRow next(input->nextRow());
            if (!next)
            {
                bool eog = (curRight != initialRight);          // processed any records?
                counter = 0;
                curRight.set(initialRight);
                if (eog)
                    return NULL;
                next.setown(input->nextRow());
                if (!next)
                    return NULL;
            }

            RtlDynamicRowBuilder rowBuilder(rowAllocator);
            RtlDynamicRowBuilder rightRowBuilder(rightRowAllocator);
            size32_t outSize = helper.transform(rowBuilder, rightRowBuilder, next, curRight, ++counter);

            if (outSize)
            {
                size32_t rightSize = rightRowAllocator->queryOutputMeta()->getRecordSize(rightRowBuilder.getSelf());    // yuk
                curRight.setown(rightRowBuilder.finalizeRowClear(rightSize));
                processed++;
                return rowBuilder.finalizeRowClear(outSize);
            }
        }
    }
    catch(IException * e)
    {
        throw makeWrappedException(e);
    }
}

//=====================================================================================================

CHThorNormalizeActivity::CHThorNormalizeActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorNormalizeArg &_arg, ThorActivityKind _kind, EclGraph & _graph) : CHThorSimpleActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(_arg)
{
    IRecordSize* recSize = outputMeta;
    if (recSize == NULL)
        throw MakeStringException(2, "Unexpected null pointer from helper.queryOutputMeta()");
}

CHThorNormalizeActivity::~CHThorNormalizeActivity()
{
}

void CHThorNormalizeActivity::ready()
{
    CHThorSimpleActivityBase::ready();
    numThisRow = 0;
    curRow = 0;
    numProcessedLastGroup = processed;
}

const void *CHThorNormalizeActivity::nextRow()
{
    for (;;)
    {
        while (curRow == numThisRow)
        {
            inbuff.setown(input->nextRow());
            if (!inbuff && (processed == numProcessedLastGroup))
                inbuff.setown(input->nextRow());
            if (!inbuff)
            {
                numProcessedLastGroup = processed;
                return NULL;
            }

            curRow = 0;
            numThisRow = helper.numExpandedRows(inbuff);
        }


        try
        {
            RtlDynamicRowBuilder rowBuilder(rowAllocator);
            memsize_t thisSize = helper.transform(rowBuilder, inbuff, ++curRow);
            if(thisSize != 0)
            {
                processed++;
                return rowBuilder.finalizeRowClear(thisSize);
            }
        }
        catch(IException * e)
        {
            throw makeWrappedException(e);
        }
    }
}


//=====================================================================================================

CHThorNormalizeChildActivity::CHThorNormalizeChildActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorNormalizeChildArg &_arg, ThorActivityKind _kind, EclGraph & _graph) : CHThorSimpleActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(_arg)
{
}

CHThorNormalizeChildActivity::~CHThorNormalizeChildActivity()
{
}

bool CHThorNormalizeChildActivity::advanceInput()
{
    for (;;)
    {
        inbuff.setown(input->nextRow());
        if (!inbuff && (processed == numProcessedLastGroup))
            inbuff.setown(input->nextRow());
        if (!inbuff)
        {
            numProcessedLastGroup = processed;
            return false;
        }

        curChildRow = cursor->first(inbuff);
        if (curChildRow)
        {
            curRow = 0;
            return true;
        }
    }
}

void CHThorNormalizeChildActivity::stop()
{
    inbuff.clear();
    CHThorSimpleActivityBase::stop();
}

void CHThorNormalizeChildActivity::ready()
{
    CHThorSimpleActivityBase::ready();
    curRow = 0;
    numProcessedLastGroup = processed;
    cursor = helper.queryIterator();
    curChildRow = NULL;
}

const void *CHThorNormalizeChildActivity::nextRow()
{
    for (;;)
    {
        if (!inbuff)
        {
            if (!advanceInput())
                return NULL;
        }

        try
        {
            RtlDynamicRowBuilder rowBuilder(rowAllocator);
            size32_t outSize = helper.transform(rowBuilder, inbuff, curChildRow, ++curRow);
            curChildRow = cursor->next();
            if (!curChildRow)
                inbuff.clear();
            if (outSize != 0)
            {
                processed++;
                return rowBuilder.finalizeRowClear(outSize);
            }
        }
        catch(IException * e)
        {
            throw makeWrappedException(e);
        }
    }
}

//=================================================================================
bool CHThorNormalizeLinkedChildActivity::advanceInput()
{
    for (;;)
    {
        curParent.setown(input->nextRow());
        if (!curParent && (processed == numProcessedLastGroup))
            curParent.setown(input->nextRow());
        if (!curParent)
        {
            numProcessedLastGroup = processed;
            return false;
        }

        curChild.set(helper.first(curParent));
        if (curChild)
            return true;
    }
}

CHThorNormalizeLinkedChildActivity::CHThorNormalizeLinkedChildActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorNormalizeLinkedChildArg &_arg, ThorActivityKind _kind, EclGraph & _graph)
    : CHThorSimpleActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(_arg)
{
}
CHThorNormalizeLinkedChildActivity::~CHThorNormalizeLinkedChildActivity()
{
}

void CHThorNormalizeLinkedChildActivity::ready()
{
    numProcessedLastGroup = 0;
    CHThorSimpleActivityBase::ready();
}

void CHThorNormalizeLinkedChildActivity::stop()
{
    curParent.clear();
    curChild.clear();
    CHThorSimpleActivityBase::stop(); 
}

const void * CHThorNormalizeLinkedChildActivity::nextRow()
{
    for (;;)
    {
        if (!curParent)
        {
            if (!advanceInput())
                return NULL;
        }
        try
        {
            const void *ret = curChild.getClear();
            curChild.set(helper.next());
            if (!curChild)
                curParent.clear();
            if (ret)
            {
                processed++;
                return ret;
            }
        }
        catch (IException *E)
        {
            throw makeWrappedException(E);
        }
    }
}

//=====================================================================================================
CHThorProjectActivity::CHThorProjectActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorProjectArg &_arg, ThorActivityKind _kind, EclGraph & _graph) : CHThorSimpleActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(_arg)
{
}

CHThorProjectActivity::~CHThorProjectActivity()
{
}

void CHThorProjectActivity::ready()
{
    CHThorSimpleActivityBase::ready();
    numProcessedLastGroup = processed;
}


const void * CHThorProjectActivity::nextRow()
{
    for (;;)
    {
        OwnedConstRoxieRow in(input->nextRow());
        if (!in)
        {
            if (numProcessedLastGroup == processed)
                in.setown(input->nextRow());
            if (!in)
            {
                numProcessedLastGroup = processed;
                return NULL;
            }
        }

        try
        {
            RtlDynamicRowBuilder rowBuilder(rowAllocator);
            size32_t outSize = helper.transform(rowBuilder, in);
            if (outSize)
            {
                processed++;
                return rowBuilder.finalizeRowClear(outSize);
            }
        }
        catch(IException * e)
        {
            throw makeWrappedException(e);
        }
    }
}

//=====================================================================================================
CHThorPrefetchProjectActivity::CHThorPrefetchProjectActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorPrefetchProjectArg &_arg, ThorActivityKind _kind, EclGraph & _graph) : CHThorSimpleActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(_arg)
{
}

void CHThorPrefetchProjectActivity::ready()
{
    CHThorSimpleActivityBase::ready();
    recordCount = 0;
    numProcessedLastGroup = processed;
    eof = !helper.canMatchAny();
    child = helper.queryChild();
}

const void * CHThorPrefetchProjectActivity::nextRow()
{
    if (eof)
        return NULL;
    for (;;)
    {
        try
        {
            OwnedConstRoxieRow row(input->nextRow());
            if (!row)
            {
                if (numProcessedLastGroup == processed)
                    row.setown(input->nextRow());
                if (!row)
                {
                    numProcessedLastGroup = processed;
                    return NULL;
                }
            }

            ++recordCount;
            rtlRowBuilder extract;
            if (helper.preTransform(extract,row,recordCount))
            {
                Owned<IEclGraphResults> results;
                if (child)
                {
                    results.setown(child->evaluate(extract.size(), extract.getbytes()));
                }
                RtlDynamicRowBuilder rowBuilder(rowAllocator);
                size32_t outSize = helper.transform(rowBuilder, row, results, recordCount);
                if (outSize)
                {
                    processed++;
                    return rowBuilder.finalizeRowClear(outSize);
                }
            }
        }
        catch(IException * e)
        {
            throw makeWrappedException(e);
        }
    }
}

//=====================================================================================================
CHThorFilterProjectActivity::CHThorFilterProjectActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorFilterProjectArg &_arg, ThorActivityKind _kind, EclGraph & _graph) : CHThorSimpleActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(_arg)
{
}

CHThorFilterProjectActivity::~CHThorFilterProjectActivity()
{
}

void CHThorFilterProjectActivity::ready()
{
    CHThorSimpleActivityBase::ready();
    recordCount = 0;
    numProcessedLastGroup = processed;
    eof = !helper.canMatchAny();
}


const void * CHThorFilterProjectActivity::nextRow()
{
    if (eof)
        return NULL;
    for (;;)
    {
        OwnedConstRoxieRow in = input->nextRow();
        if (!in)
        {
            recordCount = 0;
            if (numProcessedLastGroup == processed)
                in.setown(input->nextRow());
            if (!in)
            {
                numProcessedLastGroup = processed;
                return NULL;
            }
        }

        try
        {
            RtlDynamicRowBuilder rowBuilder(rowAllocator);
            size32_t outSize = helper.transform(rowBuilder, in, ++recordCount);
            if (outSize)
            {
                processed++;
                return rowBuilder.finalizeRowClear(outSize);    
            }
        }
        catch(IException * e)
        {
            throw makeWrappedException(e);
        }
    }
}
//=====================================================================================================

CHThorCountProjectActivity::CHThorCountProjectActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorCountProjectArg &_arg, ThorActivityKind _kind, EclGraph & _graph) : CHThorSimpleActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(_arg)
{
}

CHThorCountProjectActivity::~CHThorCountProjectActivity()
{
}

void CHThorCountProjectActivity::ready()
{
    CHThorSimpleActivityBase::ready();
    recordCount = 0;
    numProcessedLastGroup = processed;
}


const void * CHThorCountProjectActivity::nextRow()
{
    for (;;)
    {
        OwnedConstRoxieRow in = input->nextRow();
        if (!in)
        {
            recordCount = 0;
            if (numProcessedLastGroup == processed)
                in.setown(input->nextRow());
            if (!in)
            {
                numProcessedLastGroup = processed;
                return NULL;
            }
        }

        try
        {
            RtlDynamicRowBuilder rowBuilder(rowAllocator);
            size32_t outSize = helper.transform(rowBuilder, in, ++recordCount);
            if (outSize)
            {
                processed++;
                return rowBuilder.finalizeRowClear(outSize);
            }
        }
        catch(IException * e)
        {
            throw makeWrappedException(e);
        }
    }
}

//=====================================================================================================

CHThorRollupActivity::CHThorRollupActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorRollupArg &_arg, ThorActivityKind _kind, EclGraph & _graph) : CHThorSimpleActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(_arg)
{
}

CHThorRollupActivity::~CHThorRollupActivity()
{
}

void CHThorRollupActivity::ready()
{
    CHThorSimpleActivityBase::ready();
    left.setown(input->nextRow());
    prev.set(left);
}

void CHThorRollupActivity::stop()
{
    left.clear();
    prev.clear();
    right.clear();
    CHThorSimpleActivityBase::stop();
}

const void *CHThorRollupActivity::nextRow()
{
    for (;;)
    {
        right.setown(input->nextRow());
        if(!prev || !right || !helper.matches(prev,right))
        {
            const void * ret = left.getClear();
            if(ret)
            {
                processed++;
            }
            left.setown(right.getClear());
            prev.set(left);
            return ret;
        }
        try
        {
            //MORE: could optimise by reusing buffer, but would have to make sure to call destructor on previous contents before overwriting
            RtlDynamicRowBuilder rowBuilder(rowAllocator);
            if(unsigned outSize = helper.transform(rowBuilder, left, right))
            {
                left.setown(rowBuilder.finalizeRowClear(outSize));
            }
            if (helper.getFlags() & RFrolledismatchleft)
                prev.set(left);
            else
                prev.set(right);
        }
        catch(IException * e)
        {
            throw makeWrappedException(e);
        }
    }
}

//=====================================================================================================

CHThorGroupDedupActivity::CHThorGroupDedupActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorDedupArg &_arg, ThorActivityKind _kind, EclGraph & _graph) : CHThorSimpleActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(_arg)
{
}

void CHThorGroupDedupActivity::ready()
{
    CHThorSimpleActivityBase::ready();
    numToKeep = helper.numToKeep();
    numKept = 0;
}

//=====================================================================================================

CHThorGroupDedupKeepLeftActivity::CHThorGroupDedupKeepLeftActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorDedupArg &_arg, ThorActivityKind _kind, EclGraph & _graph) : CHThorGroupDedupActivity(_agent, _activityId, _subgraphId, _arg, _kind, _graph)
{
}

void CHThorGroupDedupKeepLeftActivity::ready()
{
    CHThorGroupDedupActivity::ready();
    prev.clear();
}

void CHThorGroupDedupKeepLeftActivity::stop()
{
    prev.clear();
    CHThorSimpleActivityBase::stop();
}

const void *CHThorGroupDedupKeepLeftActivity::nextRow()
{
    OwnedConstRoxieRow next;
    for (;;)
    {
        next.setown(input->nextRow());
        if (!prev || !next || !helper.matches(prev,next))
        {
            numKept = 0;
            break;
        }

        if (numKept < numToKeep-1)
        {
            numKept++;
            break;
        }
    }

    const void * ret = next.getClear();
    prev.set(ret);
    if(ret)
        processed++;
    return ret;
}

const void * CHThorGroupDedupKeepLeftActivity::nextRowGE(const void * seek, unsigned numFields, bool &wasCompleteMatch, const SmartStepExtra &stepExtra)
{
    OwnedConstRoxieRow next;
    for (;;)
    {
        next.setown(input->nextRowGE(seek, numFields, wasCompleteMatch, stepExtra));
        if (!prev || !next || !helper.matches(prev,next))
        {
            numKept = 0;
            break;
        }

        if (numKept < numToKeep-1)
        {
            numKept++;
            break;
        }
    }

    const void * ret = next.getClear();
    prev.set(ret);
    if(ret)
        processed++;
    return ret;
}

void CHThorGroupDedupKeepLeftActivity::setInput(unsigned index, IHThorInput *_input)
{
    CHThorGroupDedupActivity::setInput(index, _input);
    if (input)
        inputStepping = input->querySteppingMeta();
}

IInputSteppingMeta * CHThorGroupDedupKeepLeftActivity::querySteppingMeta()
{
    return inputStepping;
}

bool CHThorGroupDedupKeepLeftActivity::gatherConjunctions(ISteppedConjunctionCollector & collector)
{
    return input->gatherConjunctions(collector);
}

void CHThorGroupDedupKeepLeftActivity::resetEOF()
{
    input->resetEOF();
}


//=====================================================================================================

CHThorGroupDedupKeepRightActivity::CHThorGroupDedupKeepRightActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorDedupArg &_arg, ThorActivityKind _kind, EclGraph & _graph) : CHThorGroupDedupActivity(_agent, _activityId, _subgraphId, _arg, _kind, _graph), compareBest(nullptr)
{
}

void CHThorGroupDedupKeepRightActivity::ready()
{
    CHThorGroupDedupActivity::ready();
    assertex(numToKeep==1);
    firstDone = false;
    if (helper.keepBest())
        compareBest = helper.queryCompareBest();
}

void CHThorGroupDedupKeepRightActivity::stop()
{
    kept.clear();
    CHThorGroupDedupActivity::stop();
}

const void *CHThorGroupDedupKeepRightActivity::nextRow()
{
    if (!firstDone)
    {
        firstDone = true;
        kept.setown(input->nextRow());
    }

    OwnedConstRoxieRow next;
    for (;;)
    {
        next.setown(input->nextRow());
        if (!kept || !next || !helper.matches(kept,next))
        {
            numKept = 0;
            break;
        }

        if (compareBest)
        {
            if (compareBest->docompare(kept,next) > 0)
                kept.setown(next.getClear());
        }
        else
        {
            if (numKept < numToKeep-1)
            {
                numKept++;
                break;
            }

            kept.setown(next.getClear());
        }
    }

    const void * ret = kept.getClear();
    kept.setown(next.getClear());
    if(ret)
        processed++;
    return ret;
}

//=====================================================================================================

CHThorGroupDedupAllActivity::CHThorGroupDedupAllActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorDedupArg &_arg, ThorActivityKind _kind, EclGraph & _graph) : CHThorSimpleActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(_arg)
{
}

void CHThorGroupDedupAllActivity::ready()
{
    CHThorSimpleActivityBase::ready();
    keepLeft = helper.keepLeft();
    primaryCompare = helper.queryComparePrimary();
    assertex(helper.numToKeep() == 1);
    firstDone = false;
    survivorIndex = 0;
}

void CHThorGroupDedupAllActivity::stop()
{
    survivors.clear();
    CHThorSimpleActivityBase::stop();
}

bool CHThorGroupDedupAllActivity::calcNextDedupAll()
{
    survivors.clear();
    survivorIndex = 0;

    OwnedRowArray group;
    const void * next;
    while((next = input->nextRow()) != NULL)
        group.append(next);
    if(group.ordinality() == 0)
        return false;

    unsigned max = group.ordinality();
    if (primaryCompare)
    {
        //hard, if not impossible, to hit this code once optimisations in place
        MemoryAttr indexbuff(max*sizeof(void *));
        void ** temp = (void **)indexbuff.bufferBase();
        void ** rows = (void * *)group.getArray();
        msortvecstableinplace(rows, max, *primaryCompare, temp);
        unsigned first = 0;
        for (unsigned idx = 1; idx < max; idx++)
        {
            if (primaryCompare->docompare(rows[first], rows[idx]) != 0)
            {
                dedupRange(first, idx, group);
                first = idx;
            }
        }
        dedupRange(first, max, group);

        for(unsigned idx2=0; idx2<max; ++idx2)
        {
            void * cur = rows[idx2];
            if(cur)
            {
                LinkRoxieRow(cur);
                survivors.append(cur);
            }
        }
    }
    else
    {
        dedupRange(0, max, group);
        for(unsigned idx=0; idx<max; ++idx)
        {
            const void * cur = group.itemClear(idx);
            if(cur)
                survivors.append(cur);
        }
    }

    return true;
}

void CHThorGroupDedupAllActivity::dedupRange(unsigned first, unsigned last, OwnedRowArray & group)
{
    for (unsigned idxL = first; idxL < last; idxL++)
    {
        const void * left = group.item(idxL);
        if (left)
        {
            for (unsigned idxR = first; idxR < last; idxR++)
            {
                const void * right = group.item(idxR);
                if ((idxL != idxR) && right)
                {
                    if (helper.matches(left, right))
                    {
                        if (keepLeft)
                        {
                            group.replace(NULL, idxR);
                        }
                        else
                        {
                            group.replace(NULL, idxL);
                            break;
                        }
                    }
                }
            }
        }
    }
}

const void *CHThorGroupDedupAllActivity::nextRow()
{
    if (!firstDone)
    {
        firstDone = true;
        calcNextDedupAll();
    }

    if(survivors.isItem(survivorIndex))
    {
        processed++;
        return survivors.itemClear(survivorIndex++);
    }
    calcNextDedupAll();
    return NULL;
}

//=====================================================================================================
bool HashDedupTable::insert(const void * row)
{
    unsigned hash = helper.queryHash()->hash(row);
    RtlDynamicRowBuilder keyRowBuilder(keyRowAllocator, true);
    size32_t thisKeySize = helper.recordToKey(keyRowBuilder, row);
    OwnedConstRoxieRow keyRow = keyRowBuilder.finalizeRowClear(thisKeySize);
    if (find(hash, keyRow.get()))
        return false;
    addNew(new HashDedupElement(hash, keyRow.getClear()), hash);
    return true;
}
bool HashDedupTable::insertBest(const void * nextrow)
{
    unsigned hash = helper.queryHash()->hash(nextrow);
    const void *et = find(hash, nextrow);
    if (et)
    {
        const HashDedupElement *element = reinterpret_cast<const HashDedupElement *>(et);
        const void * row = element->queryRow();
        if (queryBestCompare->docompare(row,nextrow) <= 0)
            return false;
        removeExact( const_cast<void *>(et));
        // drop-through to add new row
    }
    LinkRoxieRow(nextrow);
    addNew(new HashDedupElement(hash, nextrow), hash);
    return true;
}

CHThorHashDedupActivity::CHThorHashDedupActivity(IAgentContext & _agent, unsigned _activityId, unsigned _subgraphId, IHThorHashDedupArg & _arg, ThorActivityKind _kind, EclGraph & _graph)
: CHThorSimpleActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(_arg), table(_arg), hashTableFilled(false), hashDedupTableIter(table)
{
    keepBest = helper.keepBest();
}

void CHThorHashDedupActivity::ready()
{
    CHThorSimpleActivityBase::ready();
    table.setRowAllocator(agent.queryCodeContext()->getRowAllocator(helper.queryKeySize(), activityId));
}

void CHThorHashDedupActivity::stop()
{
    table.kill();
    CHThorSimpleActivityBase::stop();
}

const void * CHThorHashDedupActivity::nextRow()
{
    if (keepBest)
    {
        // Populate hash table with best rows
        if (!hashTableFilled)
        {
            OwnedConstRoxieRow next(input->nextRow());
            while(next)
            {
                table.insertBest(next);
                next.setown(input->nextRow());
            }
            hashTableFilled = true;
            hashDedupTableIter.first();
        }

        // Iterate through hash table returning rows
        if (hashDedupTableIter.isValid())
        {
            HashDedupElement &el = hashDedupTableIter.query();

            OwnedConstRoxieRow row(el.getRow());
            hashDedupTableIter.next();
            return row.getClear();
        }
        table.kill();
        hashTableFilled = false;
        return NULL;
    }
    else
    {
        while(true)
        {
            OwnedConstRoxieRow next(input->nextRow());
            if(!next)
            {
                table.kill();
                return NULL;
            }
            if(table.insert(next))
                return next.getClear();
        }
    }
}

//=====================================================================================================

CHThorSteppableActivityBase::CHThorSteppableActivityBase(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorArg & _help, ThorActivityKind _kind, EclGraph & _graph) : CHThorSimpleActivityBase(_agent, _activityId, _subgraphId, _help, _kind, _graph)
{
    inputStepping = NULL;
    stepCompare = NULL;
}

void CHThorSteppableActivityBase::setInput(unsigned index, IHThorInput *_input)
{
    CHThorSimpleActivityBase::setInput(index, _input);
    if (input && index == 0)
    {
        inputStepping = input->querySteppingMeta();
        if (inputStepping)
            stepCompare = inputStepping->queryCompare();
    }
}

IInputSteppingMeta * CHThorSteppableActivityBase::querySteppingMeta()
{
    return inputStepping;
}

//=====================================================================================================

CHThorFilterActivity::CHThorFilterActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorFilterArg &_arg, ThorActivityKind _kind, EclGraph & _graph) : CHThorSteppableActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(_arg)
{
}

void CHThorFilterActivity::ready()
{
    CHThorSimpleActivityBase::ready();
    anyThisGroup = false;
    eof = !helper.canMatchAny();
}

const void * CHThorFilterActivity::nextRow()
{
    if (eof)
        return NULL;

    for (;;)
    {
        OwnedConstRoxieRow ret(input->nextRow());
        if (!ret)
        {
            //stop returning two NULLs in a row.
            if (anyThisGroup)
            {
                anyThisGroup = false;
                return NULL;
            }
            ret.setown(input->nextRow());
            if (!ret)
                return NULL;                // eof...
        }

        if (helper.isValid(ret))
        {
            anyThisGroup = true;
            processed++;
            return ret.getClear();
        }
    }
}

const void * CHThorFilterActivity::nextRowGE(const void * seek, unsigned numFields, bool &wasCompleteMatch, const SmartStepExtra &stepExtra)
{
    if (eof)
        return NULL;

    OwnedConstRoxieRow ret(input->nextRowGE(seek, numFields, wasCompleteMatch, stepExtra));
    if (!ret)
        return NULL;

    if (helper.isValid(ret))
    {
        anyThisGroup = true;
        processed++;
        return ret.getClear();
    }

    return ungroupedNextRow();
}

bool CHThorFilterActivity::gatherConjunctions(ISteppedConjunctionCollector & collector) 
{ 
    return input->gatherConjunctions(collector); 
}

void CHThorFilterActivity::resetEOF() 
{ 
    //Sometimes the smart stepping code returns a premature eof indicator (two nulls) and will
    //therefore call resetEOF so the activity can reset its eof without resetting the activity itself.
    //Note that resetEOF only needs to be implemented by activities that implement gatherConjunctions()
    //and that cache eof.
    eof = false;
    anyThisGroup = false;
    input->resetEOF(); 
}

//=====================================================================================================

CHThorFilterGroupActivity::CHThorFilterGroupActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorFilterGroupArg &_arg, ThorActivityKind _kind, EclGraph & _graph) : CHThorSteppableActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(_arg)
{
}

void CHThorFilterGroupActivity::ready()
{
    CHThorSimpleActivityBase::ready();
    eof = !helper.canMatchAny();
    nextIndex = 0;
}

void CHThorFilterGroupActivity::stop()
{
    CHThorSimpleActivityBase::stop();
    pending.clear();
}

const void * CHThorFilterGroupActivity::nextRow()
{
    for (;;)
    {
        if (eof)
            return NULL;

        if (pending.ordinality())
        {
            if (pending.isItem(nextIndex))
            {
                processed++;
                return pending.itemClear(nextIndex++);
            }
            nextIndex = 0;
            pending.clear();
            return NULL;
        }

        const void * ret = input->nextRow();
        while (ret)
        {
            pending.append(ret);
            ret = input->nextRow();
        }

        unsigned num = pending.ordinality();
        if (num != 0)
        {
            if (!helper.isValid(num, (const void * *)pending.getArray()))
                pending.clear();        // read next group
        }
        else
            eof = true;
    }
}

const void * CHThorFilterGroupActivity::nextRowGE(const void * seek, unsigned numFields, bool &wasCompleteMatch, const SmartStepExtra &stepExtra)
{
    if (eof)
        return NULL;

    if (pending.ordinality())
    {
        while (pending.isItem(nextIndex))
        {
            OwnedConstRoxieRow ret(pending.itemClear(nextIndex++));
            if (stepCompare->docompare(ret, seek, numFields) >= 0)
            {
                processed++;
                return ret.getClear();
            }
        }
        nextIndex = 0;
        pending.clear();
    }

    const void * ret = input->nextRowGE(seek, numFields, wasCompleteMatch, stepExtra);
    while (ret)
    {
        pending.append(ret);
        ret = input->nextRow();
    }

    unsigned num = pending.ordinality();
    if (num != 0)
    {
        if (!helper.isValid(num, (const void * *)pending.getArray()))
            pending.clear();        // read next group
    }
    else
        eof = true;

    return ungroupedNextRow();
}


//=====================================================================================================

CHThorLimitActivity::CHThorLimitActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorLimitArg &_arg, ThorActivityKind _kind, EclGraph & _graph) : CHThorSteppableActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(_arg)
{
}

void CHThorLimitActivity::ready()
{
    CHThorSimpleActivityBase::ready();
    rowLimit = helper.getRowLimit();
    numGot = 0;
}

const void * CHThorLimitActivity::nextRow()
{
    OwnedConstRoxieRow ret(input->nextRow());
    if (ret)
    {
        if (++numGot > rowLimit)
        {
            if ( agent.queryCodeContext()->queryDebugContext())
                agent.queryCodeContext()->queryDebugContext()->checkBreakpoint(DebugStateLimit, NULL, static_cast<IActivityBase *>(this));
            helper.onLimitExceeded();
            return NULL;
        }
        processed++;
    }
    
    return ret.getClear();
}

const void * CHThorLimitActivity::nextRowGE(const void * seek, unsigned numFields, bool &wasCompleteMatch, const SmartStepExtra &stepExtra)
{
    OwnedConstRoxieRow ret(input->nextRowGE(seek, numFields, wasCompleteMatch, stepExtra));
    if (ret)
    {
        if (++numGot > rowLimit)
        {
            if ( agent.queryCodeContext()->queryDebugContext())
                agent.queryCodeContext()->queryDebugContext()->checkBreakpoint(DebugStateLimit, NULL, static_cast<IActivityBase *>(this));
            helper.onLimitExceeded();
            return NULL;
        }
        processed++;
    }
    
    return ret.getClear();
}

//=====================================================================================================

CHThorSkipLimitActivity::CHThorSkipLimitActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorLimitArg &_arg, ThorActivityKind _kind, EclGraph & _graph) : CHThorSimpleActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(_arg)
{
}

void CHThorSkipLimitActivity::ready()
{
    CHThorSimpleActivityBase::ready();
    rowLimit = helper.getRowLimit();
}

void CHThorSkipLimitActivity::stop()
{
    CHThorSimpleActivityBase::stop();
    buffer.clear();
}

const void * CHThorSkipLimitActivity::nextRow()
{
    if(!buffer)
    {
        buffer.setown(new CRowBuffer(input->queryOutputMeta(), true));
        if(!buffer->pull(input, rowLimit))
        {
            if ( agent.queryCodeContext()->queryDebugContext())
                agent.queryCodeContext()->queryDebugContext()->checkBreakpoint(DebugStateLimit, NULL, static_cast<IActivityBase *>(this));
            onLimitExceeded();
        }
    }
    const void * next = buffer->next();
    if(next)
        processed++;
    return next;
}

//=====================================================================================================

CHThorCatchActivity::CHThorCatchActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorCatchArg &_arg, ThorActivityKind _kind, EclGraph & _graph) : CHThorSteppableActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(_arg)
{
}

const void * CHThorCatchActivity::nextRow()
{
    try
    {
        OwnedConstRoxieRow ret(input->nextRow());
        if (ret)
            processed++;
        return ret.getClear();
    }
    catch (IException *E)
    {
        E->Release();
        helper.onExceptionCaught();
    }
    catch (...)
    {
        helper.onExceptionCaught();
    }
    throwUnexpected(); // onExceptionCaught should have thrown something
}

const void * CHThorCatchActivity::nextRowGE(const void * seek, unsigned numFields, bool &wasCompleteMatch, const SmartStepExtra &stepExtra)
{
    try
    {
        OwnedConstRoxieRow ret(input->nextRowGE(seek, numFields, wasCompleteMatch, stepExtra));
        if (ret)
            processed++;
        return ret.getClear();
    }
    catch (IException *E)
    {
        E->Release();
        helper.onExceptionCaught();
    }
    catch (...)
    {
        helper.onExceptionCaught();
    }
    throwUnexpected(); // onExceptionCaught should have thrown something
}

//=====================================================================================================

CHThorSkipCatchActivity::CHThorSkipCatchActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorCatchArg &_arg, ThorActivityKind _kind, EclGraph & _graph) : CHThorSimpleActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(_arg)
{
}

void CHThorSkipCatchActivity::stop()
{
    CHThorSimpleActivityBase::stop();
    buffer.clear();
}

void CHThorSkipCatchActivity::onException(IException *E)
{
    buffer->clear();
    if (kind == TAKcreaterowcatch)
    {
        createRowAllocator();
        RtlDynamicRowBuilder rowBuilder(rowAllocator);
        size32_t newSize = helper.transformOnExceptionCaught(rowBuilder, E);
        if (newSize)
            buffer->insert(rowBuilder.finalizeRowClear(newSize));
    }
    E->Release();
}


const void * CHThorSkipCatchActivity::nextRow()
{
    if(!buffer)
    {
        buffer.setown(new CRowBuffer(input->queryOutputMeta(), true));
        try
        {
            buffer->pull(input, (unsigned __int64) -1);
        }
        catch (IException *E)
        {
            onException(E);
        }
        catch (...)
        {
            onException(MakeStringException(2, "Unknown exception caught"));
        }
    }
    const void * next = buffer->next();
    if(next)
        processed++;
    return next;
}

//=====================================================================================================

CHThorOnFailLimitActivity::CHThorOnFailLimitActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorLimitArg &_arg, ThorActivityKind _kind, EclGraph & _graph) : CHThorSkipLimitActivity(_agent, _activityId, _subgraphId, _arg, _kind, _graph)
{
}

void CHThorOnFailLimitActivity::onLimitExceeded() 
{ 
    buffer->clear(); 

    RtlDynamicRowBuilder rowBuilder(rowAllocator);
    size32_t newSize = helper.transformOnLimitExceeded(rowBuilder);
    if (newSize)
        buffer->insert(rowBuilder.finalizeRowClear(newSize));
}

//=====================================================================================================

CHThorIfActivity::CHThorIfActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorIfArg &_arg, ThorActivityKind _kind, EclGraph & _graph) : CHThorSimpleActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(_arg)
{
    inputTrue = NULL;
    inputFalse = NULL;
    selectedInput = NULL;
}


void CHThorIfActivity::stop()
{
    if (selectedInput)
        selectedInput->stop();
    CHThorSimpleActivityBase::stop();
}


void CHThorIfActivity::ready()
{
    CHThorSimpleActivityBase::ready();
    selectedInput = helper.getCondition() ? inputTrue : inputFalse;
    if (selectedInput)
        selectedInput->ready();
}


void CHThorIfActivity::setInput(unsigned index, IHThorInput *_input)
{
    if (index==0)
        inputTrue = _input;
    else if (index == 1)
        inputFalse = _input;
    else
        CHThorActivityBase::setInput(index, _input);
}

const void * CHThorIfActivity::nextRow()
{
    if (!selectedInput)
        return NULL;

    const void *ret = selectedInput->nextRow();
    if (ret)
        processed++;
    return ret;
}

//=====================================================================================================

CHThorCaseActivity::CHThorCaseActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorCaseArg &_arg, ThorActivityKind _kind, EclGraph & _graph) : CHThorMultiInputActivity(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(_arg)
{
}

void CHThorCaseActivity::ready()
{
    //Evaluate the condition here to avoid calling ready() on the unused branch?
    initialProcessed = processed;
    selectedInput = NULL;
    unsigned whichBranch = helper.getBranch();
    if (whichBranch >= inputs.ordinality())
        whichBranch = inputs.ordinality()-1;
    selectedInput = inputs.item(whichBranch);
    selectedInput->ready();
}

void CHThorCaseActivity::stop()
{
    if (selectedInput)
        selectedInput->stop();
}

const void *CHThorCaseActivity::nextRow()
{
    if (!selectedInput)
        return NULL;

    const void *ret = selectedInput->nextRow();
    if (ret)
        processed++;
    return ret;
}


//=====================================================================================================

CHThorSampleActivity::CHThorSampleActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorSampleArg &_arg, ThorActivityKind _kind, EclGraph & _graph) : CHThorSimpleActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(_arg)
{
}

void CHThorSampleActivity::ready()
{
    CHThorSimpleActivityBase::ready();
    numSamples = helper.getProportion();
    whichSample = helper.getSampleNumber();
    numToSkip = (whichSample ? whichSample-1 : 0);
    anyThisGroup = false;
}

const void * CHThorSampleActivity::nextRow()
{
    for (;;)
    {
        OwnedConstRoxieRow ret(input->nextRow());
        if (!ret)
        {
            //this does work with groups - may or may not be useful...
            //reset the sample for each group.... probably best.
            numToSkip = (whichSample ? whichSample-1 : 0);
            if (anyThisGroup)
            {
                anyThisGroup = false;
                return NULL;
            }
            ret.setown(input->nextRow());
            if (!ret)
                return NULL;                // eof...
        }

        if (numToSkip == 0)
        {
            anyThisGroup = true;
            numToSkip = numSamples-1;
            processed++;
            return ret.getClear();
        }
        numToSkip--;
    }
}

//=====================================================================================================

CHThorAggregateActivity::CHThorAggregateActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorAggregateArg &_arg, ThorActivityKind _kind, EclGraph & _graph) : CHThorSimpleActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(_arg)
{
}

void CHThorAggregateActivity::ready()
{
    CHThorSimpleActivityBase::ready();
    eof = false;
}

const void * CHThorAggregateActivity::nextRow()
{
    if (eof)
        return NULL;
    const void * next = input->nextRow();
    if (!next && input->isGrouped())
    {
        eof = true;
        return NULL;
    }
    
    RtlDynamicRowBuilder rowBuilder(rowAllocator);
    helper.clearAggregate(rowBuilder);
    
    if (next)
    {
        helper.processFirst(rowBuilder, next);
        ReleaseRoxieRow(next);
        
        bool abortEarly = (kind == TAKexistsaggregate) && !input->isGrouped();
        if (!abortEarly)
        {
            for (;;)
            {
                next = input->nextRow();
                if (!next)
                    break;

                helper.processNext(rowBuilder, next);
                ReleaseRoxieRow(next);
            }
        }
    }
    
    if (!input->isGrouped())        // either read all, or aborted early
        eof = true;
    
    processed++;
    size32_t finalSize = outputMeta.getRecordSize(rowBuilder.getSelf());
    return rowBuilder.finalizeRowClear(finalSize);
}

//=====================================================================================================

CHThorHashAggregateActivity::CHThorHashAggregateActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorHashAggregateArg &_arg, ThorActivityKind _kind, EclGraph & _graph, bool _isGroupedAggregate)
: CHThorSimpleActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph),
  aggregated(_arg, _arg),
  isGroupedAggregate(_isGroupedAggregate)
{
}

void CHThorHashAggregateActivity::ready()
{
    CHThorSimpleActivityBase::ready();
    eof = false;
    gathered = false;
}

void CHThorHashAggregateActivity::stop()
{
    aggregated.reset();
    CHThorSimpleActivityBase::stop();
}


const void * CHThorHashAggregateActivity::nextRow()
{
    if (eof)
        return NULL;

    if (!gathered)
    {
        bool eog = true;
        aggregated.start(rowAllocator, agent.queryCodeContext(), activityId);
        for (;;)
        {
            OwnedConstRoxieRow next(input->nextRow());
            if (!next)
            {
                if (isGroupedAggregate)
                {
                    if (eog)
                        eof = true;
                    break;
                }
                next.setown(input->nextRow());
                if (!next)
                    break;
            }
            eog = false;
            try
            {
                aggregated.addRow(next);
            }
            catch(IException * e)
            {
                throw makeWrappedException(e);
            }
        }
        gathered = true;
    }

    Owned<AggregateRowBuilder> next = aggregated.nextResult();
    if (next)
    {
        processed++;
        return next->finalizeRowClear();
    }

    if (!isGroupedAggregate)
        eof = true;

    aggregated.reset();
    gathered = false;
    return NULL;
}

//=====================================================================================================

CHThorSelectNActivity::CHThorSelectNActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorSelectNArg &_arg, ThorActivityKind _kind, EclGraph & _graph) : CHThorSimpleActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(_arg)
{
}

const void * CHThorSelectNActivity::defaultRow()
{
    if (!rowAllocator)                  
        createRowAllocator();            //We delay as often not needed...
    RtlDynamicRowBuilder rowBuilder(rowAllocator);
    size32_t thisSize = helper.createDefault(rowBuilder);
    return rowBuilder.finalizeRowClear(thisSize);
}

void CHThorSelectNActivity::ready()
{
    CHThorSimpleActivityBase::ready();
    finished = false;
}

const void * CHThorSelectNActivity::nextRow()
{
    if (finished)
        return NULL;

    finished = true;
    unsigned __int64 index = helper.getRowToSelect();
    while (--index)
    {
        OwnedConstRoxieRow next(input->nextRow());
        if (!next)
            next.setown(input->nextRow());
        if (!next)
        {
            processed++;
            return defaultRow();
        }
    }

    OwnedConstRoxieRow next(input->nextRow());
    if (!next)
        next.setown(input->nextRow());
    if (!next)
        next.setown(defaultRow());

    processed++;
    return next.getClear();
}

//=====================================================================================================

CHThorFirstNActivity::CHThorFirstNActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorFirstNArg &_arg, ThorActivityKind _kind, EclGraph & _graph) : CHThorSimpleActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(_arg)
{
    grouped = outputMeta.isGrouped();
}

void CHThorFirstNActivity::ready()
{
    CHThorSimpleActivityBase::ready();
    skip = helper.numToSkip();
    limit = helper.getLimit();
    doneThisGroup = 0;
    finished = (limit == 0);
    if (limit + skip >= limit)
        limit += skip;
}

const void * CHThorFirstNActivity::nextRow()
{
    if (finished)
        return NULL;

    OwnedConstRoxieRow ret;
    for (;;)
    {
        ret.setown(input->nextRow());
        if (!ret)
        {
            if (grouped)
            {
                if (doneThisGroup > skip)
                {
                    doneThisGroup = 0;
                    return NULL;
                }
                doneThisGroup = 0;
            }

            ret.setown(input->nextRow());
            if (!ret)
            {
                finished = true;
                return NULL;
            }

        }
        doneThisGroup++;
        if (doneThisGroup > skip)
            break;
    }

    if (doneThisGroup <= limit)
    {
        processed++;
        return ret.getClear();
    }

    if (grouped)
    {
        ret.setown(input->nextRow());
        while (ret)
            ret.setown(input->nextRow());
        doneThisGroup = 0;
    }
    else
        finished = true;
    return NULL;
}

//=====================================================================================================

CHThorChooseSetsActivity::CHThorChooseSetsActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorChooseSetsArg &_arg, ThorActivityKind _kind, EclGraph & _graph) : CHThorSimpleActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(_arg)
{
    numSets = helper.getNumSets();
    setCounts = new unsigned[numSets];
}

CHThorChooseSetsActivity::~CHThorChooseSetsActivity()
{
    delete [] setCounts;
}

void CHThorChooseSetsActivity::ready()
{
    CHThorSimpleActivityBase::ready();
    finished = false;
    memset(setCounts, 0, sizeof(unsigned)*numSets);
    helper.setCounts(setCounts);
}

const void * CHThorChooseSetsActivity::nextRow()
{
    if (finished)
        return NULL;

    for (;;)
    {
        OwnedConstRoxieRow ret(input->nextRow());
        if (!ret)
        {
            ret.setown(input->nextRow());
            if (!ret)
                return NULL;
        }
        processed++;
        switch (helper.getRecordAction(ret))
        {
        case 2:
            finished = true;
            return ret.getClear();
        case 1:
            return ret.getClear();
        }
    }
}

//=====================================================================================================

CHThorChooseSetsExActivity::CHThorChooseSetsExActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorChooseSetsExArg &_arg, ThorActivityKind _kind, EclGraph & _graph) : CHThorSimpleActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(_arg)
{
    numSets = helper.getNumSets();
    setCounts = new unsigned[numSets];
    memset(setCounts, 0, sizeof(unsigned)*numSets);
    limits = (count_t *)checked_calloc(sizeof(count_t), numSets, "choose sets ex");
    helper.getLimits(limits);
}

CHThorChooseSetsExActivity::~CHThorChooseSetsExActivity()
{
    delete [] setCounts;
    free(limits);
}

void CHThorChooseSetsExActivity::ready()
{
    CHThorSimpleActivityBase::ready();
    finished = false;
    curIndex = 0;
    memset(setCounts, 0, sizeof(unsigned)*numSets);
}

void CHThorChooseSetsExActivity::stop()
{
    gathered.clear();
    CHThorSimpleActivityBase::stop();
}

const void * CHThorChooseSetsExActivity::nextRow()
{
    if (gathered.ordinality() == 0)
    {
        curIndex = 0;
        const void * next = input->nextRow();
        while(next)
        {
            gathered.append(next);
            next = input->nextRow();
        }
        if(gathered.ordinality() == 0)
        {
            finished = true;
            return NULL;
        }

        ForEachItemIn(idx1, gathered)
        {
            unsigned category = helper.getCategory(gathered.item(idx1));
            if (category)
                setCounts[category-1]++;
        }
        calculateSelection();
    }

    while (gathered.isItem(curIndex))
    {
        OwnedConstRoxieRow row(gathered.itemClear(curIndex++));
        if (includeRow(row))
        {
            processed++;
            return row.getClear();
        }
    }

    gathered.clear();
    return NULL;
}


//=====================================================================================================

CHThorChooseSetsLastActivity::CHThorChooseSetsLastActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorChooseSetsExArg &_arg, ThorActivityKind _kind, EclGraph & _graph) : CHThorChooseSetsExActivity(_agent, _activityId, _subgraphId, _arg, _kind, _graph)
{ 
    numToSkip = (unsigned *)checked_calloc(sizeof(unsigned), numSets, "choose sets last");
}

CHThorChooseSetsLastActivity::~CHThorChooseSetsLastActivity() 
{ 
    free(numToSkip); 
}

void CHThorChooseSetsLastActivity::ready()
{
    CHThorChooseSetsExActivity::ready();
    memset(numToSkip, 0, sizeof(unsigned) * numSets);
}

void CHThorChooseSetsLastActivity::calculateSelection()
{
    for (unsigned idx=0; idx < numSets; idx++)
    {
        if (setCounts[idx] < limits[idx])
            numToSkip[idx] = 0;
        else
            numToSkip[idx] = (unsigned)(setCounts[idx] - limits[idx]);
    }
}


bool CHThorChooseSetsLastActivity::includeRow(const void * row)
{
    unsigned category = helper.getCategory(row);
    if (category)
    {
        if (numToSkip[category-1] == 0)
            return true;
        numToSkip[category-1]--;
    }
    return false;       
}


//=====================================================================================================

CHThorChooseSetsEnthActivity::CHThorChooseSetsEnthActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorChooseSetsExArg &_arg, ThorActivityKind _kind, EclGraph & _graph) : CHThorChooseSetsExActivity(_agent, _activityId, _subgraphId, _arg, _kind, _graph)
{ 
    counter = (unsigned __int64 *)checked_calloc(sizeof(unsigned __int64), numSets, "choose sets enth");
}

CHThorChooseSetsEnthActivity::~CHThorChooseSetsEnthActivity() 
{ 
    free(counter); 
}

void CHThorChooseSetsEnthActivity::ready()
{
    CHThorChooseSetsExActivity::ready();
    memset(counter, 0, sizeof(unsigned __int64) * numSets);
}

void CHThorChooseSetsEnthActivity::calculateSelection()
{
}


bool CHThorChooseSetsEnthActivity::includeRow(const void * row)
{
    unsigned category = helper.getCategory(row);
    if (category)
    {
        counter[category-1] += limits[category-1];
        if(counter[category-1] >= setCounts[category-1])
        {
            counter[category-1] -= setCounts[category-1];
            return true;
        }       
    }
    return false;       
}


//=====================================================================================================

CHThorDegroupActivity::CHThorDegroupActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorDegroupArg &_arg, ThorActivityKind _kind, EclGraph & _graph) : CHThorSteppableActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph)
{
}

const void * CHThorDegroupActivity::nextRow()
{
    const void * ret = input->ungroupedNextRow();
    if (ret)
        processed++;
    return ret;
}

const void * CHThorDegroupActivity::nextRowGE(const void * seek, unsigned numFields, bool &wasCompleteMatch, const SmartStepExtra &stepExtra)
{
    const void * ret = input->nextRowGE(seek, numFields, wasCompleteMatch, stepExtra);
    if (ret)
        processed++;
    return ret;
}


bool CHThorDegroupActivity::isGrouped()
{
    return false;
}

//=====================================================================================================

CHThorGroupActivity::CHThorGroupActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorGroupArg &_arg, ThorActivityKind _kind, EclGraph & _graph) : CHThorSteppableActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(_arg)
{
}

bool CHThorGroupActivity::isGrouped()
{
    return true;
}

void CHThorGroupActivity::ready()
{
    CHThorSimpleActivityBase::ready();
    next.clear();
    endPending = false;
    firstDone = false;
}

void CHThorGroupActivity::stop()
{
    CHThorSimpleActivityBase::stop();
    next.clear();
}

const void *CHThorGroupActivity::nextRow()
{
    if (!firstDone)
    {
        firstDone = true;
        next.setown(input->nextRow());
    }

    if (endPending)
    {
        endPending = false;
        return NULL;
    }

    OwnedConstRoxieRow prev(next.getClear());
    next.setown(input->nextRow());
    if (!next)  // skip incoming groups. (should it sub-group??)
        next.setown(input->nextRow());

    if (next)
    {
        assertex(prev);  // If this fails, you have an initial empty group. That is not legal.
        if (!helper.isSameGroup(prev, next))
            endPending = true;
    }
    if (prev)
        processed++;
    return prev.getClear();
}

const void * CHThorGroupActivity::nextRowGE(const void * seek, unsigned numFields, bool &wasCompleteMatch, const SmartStepExtra &stepExtra)
{
    if (firstDone)
    {
        if (next)
        {
            if (stepCompare->docompare(next, seek, numFields) >= 0)
                return nextRow();
        }
    }
    next.setown(input->nextRowGE(seek, numFields, wasCompleteMatch, stepExtra));
    firstDone = true;
    return nextRow();
}

//=====================================================================================================

CHThorGroupSortActivity::CHThorGroupSortActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorSortArg &_arg, ThorActivityKind _kind, EclGraph & _graph) : CHThorSimpleActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(_arg)
{
    gotSorted = false;
}

void CHThorGroupSortActivity::ready()
{
    CHThorSimpleActivityBase::ready();
    if(!sorter)
        createSorter();
}

void CHThorGroupSortActivity::stop()
{
    if(sorter)
    {
        if(sorterIsConst)
            sorter->killSorted();
        else
            sorter.clear();
    }
    gotSorted = false;
    diskReader.clear();
    CHThorSimpleActivityBase::stop();
}

const void *CHThorGroupSortActivity::nextRow()
{
    if(!gotSorted)
        getSorted();

    if(diskReader)
    {
        const void *row = diskReader->nextRow();
        if (row)
            return row;
        diskReader.clear();
    }
    else
    {
        const void * ret = sorter->getNextSorted();
        if(ret)
        {
            processed++;
            return ret;
        }
    }
    sorter->killSorted();
    gotSorted = false;
    return NULL;
}

void CHThorGroupSortActivity::createSorter()
{
    unsigned flags = helper.getAlgorithmFlags();
    sorterIsConst = ((flags & TAFconstant) != 0);
    OwnedRoxieString algoname(helper.getAlgorithm());
    if(!algoname)
    {
        if((flags & TAFunstable) != 0)
            sorter.setown(new CQuickSorter(helper.queryCompare(), queryRowManager(), InitialSortElements, CommitStep));
        else
            sorter.setown(new CHeapSorter(helper.queryCompare(), queryRowManager(), InitialSortElements, CommitStep));
        return;
    }
    if(stricmp(algoname, "quicksort") == 0)
    {
        if((flags & TAFstable) != 0)
            sorter.setown(new CStableQuickSorter(helper.queryCompare(), queryRowManager(), InitialSortElements, CommitStep, this));
        else
            sorter.setown(new CQuickSorter(helper.queryCompare(), queryRowManager(), InitialSortElements, CommitStep));
    }
    else if(stricmp(algoname, "parquicksort") == 0)
    {
        if((flags & TAFstable) != 0)
            sorter.setown(new CParallelStableQuickSorter(helper.queryCompare(), queryRowManager(), InitialSortElements, CommitStep, this));
        else
            sorter.setown(new CParallelQuickSorter(helper.queryCompare(), queryRowManager(), InitialSortElements, CommitStep));
    }
    else if(stricmp(algoname, "taskquicksort") == 0)
    {
        if((flags & TAFstable) != 0)
            sorter.setown(new CParallelTaskStableQuickSorter(helper.queryCompare(), queryRowManager(), InitialSortElements, CommitStep, this));
        else
            sorter.setown(new CParallelTaskQuickSorter(helper.queryCompare(), queryRowManager(), InitialSortElements, CommitStep));
    }
    else if(stricmp(algoname, "mergesort") == 0)
    {
        if((flags & TAFparallel) != 0)
            sorter.setown(new CParallelStableMergeSorter(helper.queryCompare(), queryRowManager(), InitialSortElements, CommitStep, this));
        else
            sorter.setown(new CStableMergeSorter(helper.queryCompare(), queryRowManager(), InitialSortElements, CommitStep, this));
    }
    else if(stricmp(algoname, "parmergesort") == 0)
        sorter.setown(new CParallelStableMergeSorter(helper.queryCompare(), queryRowManager(), InitialSortElements, CommitStep, this));
    else if(stricmp(algoname, "heapsort") == 0)
        sorter.setown(new CHeapSorter(helper.queryCompare(), queryRowManager(), InitialSortElements, CommitStep));
    else if(stricmp(algoname, "insertionsort") == 0)
    {
        if((flags & TAFstable) != 0)
            sorter.setown(new CStableInsertionSorter(helper.queryCompare(), queryRowManager(), InitialSortElements, CommitStep));
        else
            sorter.setown(new CInsertionSorter(helper.queryCompare(), queryRowManager(), InitialSortElements, CommitStep));
    }
    else
    {
        StringBuffer sb;
        sb.appendf("Ignoring unsupported sort order algorithm '%s', using default", algoname.get());
        agent.addWuExceptionEx(sb.str(),WRN_UnsupportedAlgorithm,SeverityWarning,MSGAUD_user,"hthor");
        if((flags & TAFunstable) != 0)
            sorter.setown(new CQuickSorter(helper.queryCompare(), queryRowManager(), InitialSortElements, CommitStep));
        else
            sorter.setown(new CHeapSorter(helper.queryCompare(), queryRowManager(), InitialSortElements, CommitStep));
    }
    sorter->setActivityId(activityId);
}

void CHThorGroupSortActivity::getSorted()
{
    diskMerger.clear();
    diskReader.clear();
    queryRowManager()->addRowBuffer(this);//register for OOM callbacks
    const void * next;
    while((next = input->nextRow()) != NULL)
    {
        if (!sorter->addRow(next))
        {
            {
                //Unlikely that this code will ever be executed but added for comfort
                roxiemem::RoxieOutputRowArrayLock block(sorter->getRowArray());
                sorter->flushRows();
                sortAndSpillRows();
                //Ensure new rows are written to the head of the array.  It needs to be a separate call because
                //performSort() cannot shift active row pointer since it can be called from any thread
                sorter->flushRows();
            }
            if (!sorter->addRow(next))
            {
                ReleaseRoxieRow(next);
                throw MakeStringException(0, "Insufficient memory to append sort row");
            }
        }
    }
    queryRowManager()->removeRowBuffer(this);//unregister for OOM callbacks
    sorter->flushRows();

    if(diskMerger)
    {
        sortAndSpillRows();
        sorter->killSorted();
        ICompare *compare = helper.queryCompare();
        diskReader.setown(diskMerger->merge(compare));
    }
    else
    {
        sorter->performSort();
    }
    gotSorted = true;
}

//interface roxiemem::IBufferedRowCallback
unsigned CHThorGroupSortActivity::getSpillCost() const
{
    return 10;
}


unsigned CHThorGroupSortActivity::getActivityId() const
{
    return activityId;
}

bool CHThorGroupSortActivity::freeBufferedRows(bool critical)
{
    roxiemem::RoxieOutputRowArrayLock block(sorter->getRowArray());
    return sortAndSpillRows();
}



bool CHThorGroupSortActivity::sortAndSpillRows()
{
    if (0 == sorter->numCommitted())
        return false;
    if(!diskMerger)
    {
        StringBuffer fbase;
        agent.getTempfileBase(fbase).append(PATHSEPCHAR).appendf("spill_sort_%p", this);
        PROGLOG("SORT: spilling to disk, filename base %s", fbase.str());
        class CHThorRowLinkCounter : implements IRowLinkCounter, public CSimpleInterface
        {
        public:
            IMPLEMENT_IINTERFACE_USING(CSimpleInterface);
            virtual void releaseRow(const void *row)
            {
                ReleaseRoxieRow(row);
            }
            virtual void linkRow(const void *row)
            {
                LinkRoxieRow(row);
            }
        };
        Owned<IRowLinkCounter> linker = new CHThorRowLinkCounter();
        Owned<IRowInterfaces> rowInterfaces = createRowInterfaces(input->queryOutputMeta(), activityId, 0, agent.queryCodeContext());
        diskMerger.setown(createDiskMerger(rowInterfaces, linker, fbase.str()));
    }
    sorter->performSort();
    sorter->spillSortedToDisk(diskMerger);
    return true;
}

// Base for Quick sort and both Insertion sorts

void CSimpleSorterBase::spillSortedToDisk(IDiskMerger * merger)
{
    Owned<IRowWriter> out = merger->createWriteBlock();
    for (;;)
    {
        const void *row = getNextSorted();
        if (!row)
            break;
        out->putRow(row);
    }
    finger = 0;
    out->flush();
    rowsToSort.noteSpilled(rowsToSort.numCommitted());
}

// Quick sort

void CQuickSorter::performSort()
{
    size32_t numRows = rowsToSort.numCommitted();
    if (numRows)
    {
        const void * * rows = rowsToSort.getBlock(numRows);
        qsortvec((void * *)rows, numRows, *compare);
        finger = 0;
    }
}

// Quick sort

void CParallelQuickSorter::performSort()
{
    size32_t numRows = rowsToSort.numCommitted();
    if (numRows)
    {
        const void * * rows = rowsToSort.getBlock(numRows);
        parqsortvec((void * *)rows, numRows, *compare);
        finger = 0;
    }
}

void CParallelTaskQuickSorter::performSort()
{
    size32_t numRows = rowsToSort.numCommitted();
    if (numRows)
    {
        const void * * rows = rowsToSort.getBlock(numRows);
        taskqsortvec((void * *)rows, numRows, *compare);
        finger = 0;
    }
}

// StableQuick sort

bool CStableSorter::addRow(const void * next)
{
    roxiemem::rowidx_t nextRowCapacity = rowsToSort.rowCapacity() + 1;//increment capacity for the row we are about to add
    if (nextRowCapacity > indexCapacity)
    {
        void *** newIndex = (void ***)rowManager->allocate(nextRowCapacity * sizeof(void*), activityId);//could force an OOM callback
        if (newIndex)
        {
            roxiemem::RoxieOutputRowArrayLock block(getRowArray());//could force an OOM callback after index is freed but before index,indexCapacity is updated
            ReleaseRoxieRow(index);
            index = newIndex;
            indexCapacity = RoxieRowCapacity(index) / sizeof(void*);
        }
        else
        {
            killSorted();
            ReleaseRoxieRow(next);
            throw MakeStringException(0, "Insufficient memory to allocate StableQuickSorter index");
        }
    }
    return CSimpleSorterBase::addRow(next);
}

void CStableSorter::spillSortedToDisk(IDiskMerger * merger)
{
    CSimpleSorterBase::spillSortedToDisk(merger);
    ReleaseRoxieRow(index);
    index = NULL;
    indexCapacity = 0;
}

void CStableSorter::killSorted()
{
    CSimpleSorterBase::killSorted();
    ReleaseRoxieRow(index);
    index = NULL;
    indexCapacity = 0;
}

// StableQuick sort

void CStableQuickSorter::performSort()
{
    size32_t numRows = rowsToSort.numCommitted();
    if (numRows)
    {
        const void * * rows = rowsToSort.getBlock(numRows);
        qsortvecstableinplace((void * *)rows, numRows, *compare, (void * *)index);
        finger = 0;
    }
}

void CParallelStableQuickSorter::performSort()
{
    size32_t numRows = rowsToSort.numCommitted();
    if (numRows)
    {
        const void * * rows = rowsToSort.getBlock(numRows);
        parqsortvecstableinplace((void * *)rows, numRows, *compare, (void * *)index);
        finger = 0;
    }
}

void CParallelTaskStableQuickSorter::performSort()
{
    size32_t numRows = rowsToSort.numCommitted();
    if (numRows)
    {
        const void * * rows = rowsToSort.getBlock(numRows);
        taskqsortvecstableinplace((void * *)rows, numRows, *compare, (void * *)index);
        finger = 0;
    }
}

// StableMerge sort

void CStableMergeSorter::performSort()
{
    size32_t numRows = rowsToSort.numCommitted();
    if (numRows)
    {
        const void * * rows = rowsToSort.getBlock(numRows);
        msortvecstableinplace((void * *)rows, numRows, *compare, (void * *)index);
        finger = 0;
    }
}

void CParallelStableMergeSorter::performSort()
{
    size32_t numRows = rowsToSort.numCommitted();
    if (numRows)
    {
        const void * * rows = rowsToSort.getBlock(numRows);
        parmsortvecstableinplace((void * *)rows, numRows, *compare, (void * *)index);
        finger = 0;
    }
}

// Heap sort

void CHeapSorter::performSort()
{
    size32_t numRows = rowsToSort.numCommitted();
    if (numRows)
    {
        const void * * rows = rowsToSort.getBlock(numRows);
        heapsize = numRows;
        for (unsigned i = 0; i < numRows; i++)
        {
            heap.append(i);
            heap_push_up(i, heap.getArray(), rows, compare);
        }
    }
}

void CHeapSorter::spillSortedToDisk(IDiskMerger * merger)
{
    CSimpleSorterBase::spillSortedToDisk(merger);
    heap.kill();
    heapsize = 0;
}

const void * CHeapSorter::getNextSorted()
{
    if(heapsize)
    {
        size32_t numRows = rowsToSort.numCommitted();
        if (numRows)
        {
            const void * * rows = rowsToSort.getBlock(numRows);
            unsigned top = heap.item(0);
            --heapsize;
            heap.replace(heap.item(heapsize), 0);
            heap_push_down(0, heapsize, heap.getArray(), rows, compare);
            const void * row = rows[top];
            rows[top] = NULL;
            return row;
        }
    }
    return NULL;
}

void CHeapSorter::killSorted()
{
    CSimpleSorterBase::killSorted();
    heap.kill();
    heapsize = 0;
}

// Insertion sorts

void CInsertionSorter::performSort()
{
    size32_t numRows = rowsToSort.numCommitted();
    if (numRows)
    {
        const void * * rows = rowsToSort.getBlock(numRows);
        for (unsigned i = 0; i < numRows; i++)
        {
            binary_vec_insert(rowsToSort.query(i), rows, i, *compare);
        }
        finger = 0;
    }
}

void CStableInsertionSorter::performSort()
{
    size32_t numRows = rowsToSort.numCommitted();
    if (numRows)
    {
        const void * * rows = rowsToSort.getBlock(numRows);
        for (unsigned i = 0; i < numRows; i++)
        {
            binary_vec_insert_stable(rowsToSort.query(i), rows, i, *compare);
        }
        finger = 0;
    }
}

//=====================================================================================================

CHThorGroupedActivity::CHThorGroupedActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorGroupedArg &_arg, ThorActivityKind _kind, EclGraph & _graph) : CHThorSimpleActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(_arg)
{
}

void CHThorGroupedActivity::ready()
{
    CHThorSimpleActivityBase::ready();
    firstDone = false;
    nextRowIndex = 0;
}

void CHThorGroupedActivity::stop()
{
    CHThorSimpleActivityBase::stop();
    next[0].clear();
    next[1].clear();
    next[2].clear();
}

const void *CHThorGroupedActivity::nextRow()
{
    if (!firstDone)
    {
        next[0].setown(input->nextRow());
        next[1].setown(input->nextRow());
        nextRowIndex = 0;
    }

    unsigned nextToCompare = (nextRowIndex + 1) % 3;
    unsigned nextToFill  = (nextRowIndex + 2) % 3;
    next[nextToFill].setown(input->nextRow());

    OwnedConstRoxieRow ret(next[nextRowIndex].getClear());
    if (ret)
    {
        if (next[nextToCompare]) 
        {
            if (!helper.isSameGroup(ret, next[nextToCompare]))
                throw MakeStringException(100, "GROUPED(%u), expected a group break between adjacent rows (rows %" I64F "d, %" I64F "d) ", activityId, processed+1, processed+2);
        }
        else if (next[nextToFill])
        {
            if (helper.isSameGroup(ret, next[nextToFill]))
                throw MakeStringException(100, "GROUPED(%u), unexpected group break found between rows %" I64F "d and %" I64F "d)", activityId, processed+1, processed+2);
        }
        processed++;
    }
    nextRowIndex = nextToCompare;
    return ret.getClear();
}

//=====================================================================================================

CHThorSortedActivity::CHThorSortedActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorSortedArg &_arg, ThorActivityKind _kind, EclGraph & _graph) : CHThorSteppableActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(_arg)
{
    //MORE: Should probably have a inter group and intra group sort functions
    compare = helper.queryCompare();
}

void CHThorSortedActivity::ready()
{
    CHThorSimpleActivityBase::ready();
    firstDone = false;
}

void CHThorSortedActivity::stop()
{
    CHThorSimpleActivityBase::stop();
    next.clear();
}

const void *CHThorSortedActivity::nextRow()
{
    if (!firstDone)
    {
        firstDone = true;
        next.setown(input->nextRow());
    }

    OwnedConstRoxieRow prev(next.getClear());
    next.setown(input->nextRow());
    if (prev && next)
        if (compare->docompare(prev, next) > 0)
            throw MakeStringException(100, "SORTED(%u) detected incorrectly sorted rows  (row %" I64F "d,  %" I64F "d))", activityId, processed+1, processed+2);
    if (prev)
        processed++;
    return prev.getClear();
}

const void * CHThorSortedActivity::nextRowGE(const void * seek, unsigned numFields, bool &wasCompleteMatch, const SmartStepExtra &stepExtra)
{
    if (next)
    {
        if (stepCompare->docompare(next, seek, numFields) >= 0)
            return nextRow();
    }

    firstDone = true;
    next.setown(input->nextRowGE(seek, numFields, wasCompleteMatch, stepExtra));
    return nextRow();
}


//=====================================================================================================

CHThorTraceActivity::CHThorTraceActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorTraceArg &_arg, ThorActivityKind _kind, EclGraph & _graph)
: CHThorSteppableActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph),
  helper(_arg),  keepLimit(0), skip(0), sample(0), traceEnabled(false)
{
}

void CHThorTraceActivity::ready()
{
    CHThorSimpleActivityBase::ready();
    traceEnabled = agent.queryWorkUnit()->getDebugValueBool("traceEnabled", false);
    if (traceEnabled && helper.canMatchAny())
    {
        keepLimit = helper.getKeepLimit();
        if (keepLimit==(unsigned) -1)
            keepLimit = agent.queryWorkUnit()->getDebugValueInt("traceLimit", 10);
        skip = helper.getSkip();
        sample = helper.getSample();
        if (sample)
            sample--;
        name.setown(helper.getName());
        if (!name)
            name.set("Row");
    }
    else
        keepLimit = 0;
}

void CHThorTraceActivity::stop()
{
    CHThorSimpleActivityBase::stop();
    name.clear();
}

const void *CHThorTraceActivity::nextRow()
{
    OwnedConstRoxieRow ret(input->nextRow());
    if (!ret)
        return NULL;
    onTrace(ret);
    processed++;
    return ret.getClear();
}

const void * CHThorTraceActivity::nextRowGE(const void * seek, unsigned numFields, bool &wasCompleteMatch, const SmartStepExtra &stepExtra)
{
    OwnedConstRoxieRow ret(input->nextRowGE(seek, numFields, wasCompleteMatch, stepExtra));
    if (ret)
    {
        onTrace(ret);
        processed++;
    }
    return ret.getClear();
}

void CHThorTraceActivity::onTrace(const void *row)
{
    if (keepLimit && helper.isValid(row))
    {
        if (skip)
            skip--;
        else if (sample)
            sample--;
        else
        {
            CommonXmlWriter xmlwrite(XWFnoindent);
            outputMeta.toXML((const byte *) row, xmlwrite);
            DBGLOG("TRACE: <%s>%s<%s>", name.get(), xmlwrite.str(), name.get());
            keepLimit--;
            sample = helper.getSample();
            if (sample)
                sample--;
        }
    }
}

//=====================================================================================================

void getLimitType(unsigned flags, bool & limitFail, bool & limitOnFail)
{
    if((flags & JFmatchAbortLimitSkips) != 0)
    {
        limitFail = false;
        limitOnFail = false;
    }
    else
    {
        limitOnFail = ((flags & JFonfail) != 0);
        limitFail = !limitOnFail;
    }
}

CHThorJoinActivity::CHThorJoinActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorJoinArg &_arg, ThorActivityKind _kind, EclGraph & _graph)
                : CHThorActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(_arg), outBuilder(NULL)
{
}

void CHThorJoinActivity::ready()
{
    CHThorActivityBase::ready();
    input1->ready();
    bool isStable = (helper.getJoinFlags() & JFunstable) == 0;
    RoxieSortAlgorithm sortAlgorithm = isStable ? stableSpillingQuickSortAlgorithm : spillingQuickSortAlgorithm;
    StringBuffer tempBase;
    agent.getTempfileBase(tempBase);
    if (helper.isLeftAlreadySorted())
        sortedLeftInput.setown(createDegroupedInputReader(&input->queryStream()));
    else
        sortedLeftInput.setown(createSortedInputReader(&input->queryStream(), createSortAlgorithm(sortAlgorithm, helper.queryCompareLeft(), *queryRowManager(), input->queryOutputMeta(), agent.queryCodeContext(), tempBase, activityId)));
    ICompare *compareRight = helper.queryCompareRight();
    if (helper.isRightAlreadySorted())
        groupedSortedRightInput.setown(createGroupedInputReader(&input1->queryStream(), compareRight));
    else
        groupedSortedRightInput.setown(createSortedGroupedInputReader(&input1->queryStream(), compareRight, createSortAlgorithm(sortAlgorithm, compareRight, *queryRowManager(), input1->queryOutputMeta(), agent.queryCodeContext(), tempBase, activityId)));
    outBuilder.setAllocator(rowAllocator);
    leftOuterJoin = (helper.getJoinFlags() & JFleftouter) != 0;
    rightOuterJoin = (helper.getJoinFlags() & JFrightouter) != 0;
    exclude = (helper.getJoinFlags() & JFexclude) != 0;
    getLimitType(helper.getJoinFlags(), limitFail, limitOnFail);
    if (rightOuterJoin && !defaultLeft)
        createDefaultLeft();    
    if ((leftOuterJoin || limitOnFail) && !defaultRight)
        createDefaultRight();   
    betweenjoin = ((helper.getJoinFlags() & JFslidingmatch) != 0);
    assertex(!(betweenjoin && rightOuterJoin));

    keepLimit = helper.getKeepLimit();
    if (keepLimit == 0)
        keepLimit = (unsigned)-1;
    atmostLimit = helper.getJoinLimit();
    if(atmostLimit == 0)
        atmostLimit = (unsigned)-1;
    else
        assertex(!rightOuterJoin && !betweenjoin);
    abortLimit = helper.getMatchAbortLimit();
    if (abortLimit == 0) 
        abortLimit = (unsigned)-1;

    assertex((helper.getJoinFlags() & (JFfirst | JFfirstleft | JFfirstright)) == 0); // no longer supported

    if(betweenjoin)
    {
        collate = helper.queryCompareLeftRightLower();
        collateupper = helper.queryCompareLeftRightUpper();
    }
    else
    {
        collate = collateupper = helper.queryCompareLeftRight();
    }

    rightIndex = 0;
    joinCounter = 0;
    failingLimit.clear();
    state = JSfill;
    if ((helper.getJoinFlags() & JFlimitedprefixjoin) && helper.getJoinLimit()) 
    {   //Limited Match Join (s[1..n])
        limitedhelper.setown(createRHLimitedCompareHelper());
        limitedhelper->init( helper.getJoinLimit(), groupedSortedRightInput, collate, helper.queryPrefixCompare() );
    }
}

void CHThorJoinActivity::stop()
{
    outBuilder.clear();
    right.clear();
    left.clear();
    pendingRight.clear();
    sortedLeftInput.clear();
    groupedSortedRightInput.clear();
    CHThorActivityBase::stop();
    input1->stop();
}

void CHThorJoinActivity::setInput(unsigned index, IHThorInput *_input)
{
    if (index==1)
        input1 = _input;
    else
        CHThorActivityBase::setInput(index, _input);
}

void CHThorJoinActivity::createDefaultLeft()
{
    if (!defaultLeft)
    {
        if (!defaultLeftAllocator)
            defaultLeftAllocator.setown(agent.queryCodeContext()->getRowAllocator(input->queryOutputMeta(), activityId));

        RtlDynamicRowBuilder rowBuilder(defaultLeftAllocator);
        size32_t thisSize = helper.createDefaultLeft(rowBuilder);
        defaultLeft.setown(rowBuilder.finalizeRowClear(thisSize));
    }
}

void CHThorJoinActivity::createDefaultRight()
{
    if (!defaultRight)
    {
        if (!defaultRightAllocator)
            defaultRightAllocator.setown(agent.queryCodeContext()->getRowAllocator(input1->queryOutputMeta(), activityId));

        RtlDynamicRowBuilder rowBuilder(defaultRightAllocator);
        size32_t thisSize = helper.createDefaultRight(rowBuilder);
        defaultRight.setown(rowBuilder.finalizeRowClear(thisSize));
    }
}


void CHThorJoinActivity::fillLeft()
{
    matchedLeft = false;
    left.setown(sortedLeftInput->nextRow()); // NOTE: already degrouped
    if(betweenjoin && left && pendingRight && (collate->docompare(left, pendingRight) >= 0))
        fillRight();
    if (limitedhelper && 0==rightIndex)
    {
        rightIndex = 0;
        joinCounter = 0;
        right.clear();
        matchedRight.kill();
        if (left)
        {
            limitedhelper->getGroup(right,left);
            ForEachItemIn(idx, right)
                matchedRight.append(false);
        }
    }
}

void CHThorJoinActivity::fillRight()
{
    if (limitedhelper)
        return;
    failingLimit.clear();
    if(betweenjoin && left)
    {
        aindex_t start = 0;
        while(right.isItem(start) && (collateupper->docompare(left, right.item(start)) > 0))
            start++;
        if(start>0)
            right.clearPart(0, start);
    }
    else
        right.clear();
    rightIndex = 0;
    joinCounter = 0;
    unsigned groupCount = 0;
    while(true)
    {
        OwnedConstRoxieRow next;
        if(pendingRight)
        {
            next.setown(pendingRight.getClear());
        }
        else
        {
            next.setown(groupedSortedRightInput->nextRow());
        }
        if(!rightOuterJoin && next && (!left || (collateupper->docompare(left, next) > 0))) // if right is less than left, and not right outer, can skip group
        {
            while(next) 
                next.setown(groupedSortedRightInput->nextRow());
            continue;
        }
        while(next)
        {
            if(groupCount==abortLimit)
            {
                if(limitFail)
                    failLimit();
                if ( agent.queryCodeContext()->queryDebugContext())
                    agent.queryCodeContext()->queryDebugContext()->checkBreakpoint(DebugStateLimit, NULL, static_cast<IActivityBase *>(this));
                if(limitOnFail)
                {
                    assertex(!failingLimit);
                    try
                    {
                        failLimit();
                    }
                    catch(IException * except)
                    {
                        failingLimit.setown(except);
                    }
                    assertex(failingLimit);
                }
                right.append(next.getClear());
                do
                {
                    next.setown(groupedSortedRightInput->nextRow());
                } while(next);
                break;
            }
            else if(groupCount==atmostLimit)
            {
                right.clear();
                groupCount = 0;
                while(next) 
                {
                    next.setown(groupedSortedRightInput->nextRow());
                }
            }
            else
            {
                right.append(next.getClear());
                groupCount++;
            }
            next.setown(groupedSortedRightInput->nextRow());
            
        }
        // normally only want to read one right group, but if is between join and next right group is in window for left, need to continue
        if(betweenjoin && left)
        {
            pendingRight.setown(groupedSortedRightInput->nextRow());
            if(!pendingRight || (collate->docompare(left, pendingRight) < 0))
                break;
        }
        else
            break;
    }

    matchedRight.kill();
    ForEachItemIn(idx, right)
        matchedRight.append(false);
}

const void * CHThorJoinActivity::joinRecords(const void * curLeft, const void * curRight, unsigned counter, unsigned flags)
{
    try
    {
        outBuilder.ensureRow();
        size32_t thisSize = helper.transform(outBuilder, curLeft, curRight, counter, flags);
        if(thisSize)
            return outBuilder.finalizeRowClear(thisSize);
        else
            return NULL;
    }
    catch(IException * e)
    {
        throw makeWrappedException(e);
    }
}

const void * CHThorJoinActivity::groupDenormalizeRecords(const void * curLeft, ConstPointerArray & rows, unsigned flags)
{
    try
    {
        outBuilder.ensureRow();
        unsigned numRows = rows.ordinality();
        const void * rhs = numRows ? rows.item(0) : defaultRight.get();
        if (numRows>0)
            flags |= JTFmatchedright;
        memsize_t thisSize = helper.transform(outBuilder, curLeft, rhs, numRows, (const void * *)rows.getArray(), flags);
        if(thisSize)
            return outBuilder.finalizeRowClear(thisSize);
        else
            return NULL;
    }
    catch(IException * e)
    {
        throw makeWrappedException(e);
    }
}

const void * CHThorJoinActivity::joinException(const void * curLeft, IException * except)
{
    try
    {
        outBuilder.ensureRow();
        size32_t thisSize = helper.onFailTransform(outBuilder, curLeft, defaultRight, except, JTFmatchedleft);
        if(thisSize)
            return outBuilder.finalizeRowClear(thisSize);
        else
            return NULL;
    }
    catch(IException * e)
    {
        throw makeWrappedException(e);
    }
}

void CHThorJoinActivity::failLimit()
{
    helper.onMatchAbortLimitExceeded();
    CommonXmlWriter xmlwrite(0);
    if (input->queryOutputMeta() && input->queryOutputMeta()->hasXML())
    {
        input->queryOutputMeta()->toXML((byte *)left.get(), xmlwrite);
    }
    throw MakeStringException(0, "More than %d match candidates in join for row %s", abortLimit, xmlwrite.str());
}

const void *CHThorJoinActivity::nextRow()
{
    for (;;)
    {
        switch (state)
        {
        case JSfill:
            fillLeft();
            state = JSfillright;
            break;

        case JSfillright:
            fillRight();
            state = JScollate;
            break;

        case JSfillleft:
            fillLeft();
            state = JScollate;
            break;

        case JScollate:
            if (right.ordinality() == 0)
            {
                if (!left)
                    return NULL;
                state = JSleftonly;
            }
            else
            {
                if (!left)
                    state = JSrightonly;
                else
                {
                    int diff;
                    if(betweenjoin)
                        diff = ((collate->docompare(left, right.item(0)) < 0) ? -1 : ((collateupper->docompare(left, right.item(right.ordinality()-1)) > 0) ? +1 : 0));
                    else
                        diff = collate->docompare(left, right.item(0));
                    bool limitExceeded =  right.ordinality()>abortLimit;
                    if (diff == 0)
                    {
                        if (limitExceeded)
                        {
                            const void * ret = NULL;
                            if(failingLimit)
                            {
                                if ( agent.queryCodeContext()->queryDebugContext())
                                    agent.queryCodeContext()->queryDebugContext()->checkBreakpoint(DebugStateLimit, NULL, static_cast<IActivityBase *>(this));
                                ret = joinException(left, failingLimit);
                            }
                            left.clear();
                            state = JSfillleft;
                            ForEachItemIn(idx, right)
                                matchedRight.replace(true, idx);
                            if(ret)
                            {
                                processed++;
                                return ret;
                            }
                        }
                        else
                        {
                            state = JScompare;
                            joinLimit = keepLimit;
                        }
                    }
                    else if (diff < 0)
                        state = JSleftonly;
                    else if (limitExceeded)
                    {
                        // MORE - Roxie code seems to think there should be a destroyRowset(right) here....
                        state = JSfillright;
                    }
                    else
                        state = JSrightonly;
                }
            }
            break;

        case JSrightonly:
            if (rightOuterJoin)
            {
                switch (kind)
                {
                case TAKjoin:
                    {
                        while (right.isItem(rightIndex))
                        {
                            if (!matchedRight.item(rightIndex))
                            {
                                const void * rhs = right.item(rightIndex++);
                                const void * ret = joinRecords(defaultLeft, rhs, 0, JTFmatchedright);
                                if (ret)
                                {
                                    processed++;
                                    return ret;
                                }
                            }
                            else
                                rightIndex++;
                        }
                        break;
                    }
                //Probably excessive to implement the following, but possibly useful
                case TAKdenormalize:
                    {
                        OwnedConstRoxieRow newLeft(defaultLeft.getLink());
                        unsigned rowSize = 0;
                        unsigned leftCount = 0;
                        while (right.isItem(rightIndex))
                        {
                            if (!matchedRight.item(rightIndex))
                            {
                                const void * rhs = right.item(rightIndex);
                                try
                                {
                                    RtlDynamicRowBuilder rowBuilder(rowAllocator);
                                    size32_t thisSize = helper.transform(rowBuilder, newLeft, rhs, ++leftCount, JTFmatchedright);
                                    if (thisSize)
                                    {
                                        rowSize = thisSize;
                                        newLeft.setown(rowBuilder.finalizeRowClear(rowSize));
                                    }
                                }
                                catch(IException * e)
                                {
                                    throw makeWrappedException(e);
                                }
                            }
                            rightIndex++;
                        }
                        state = JSfillright;
                        if (rowSize)
                        {
                            processed++;
                            return newLeft.getClear();
                        }
                        break;
                    }
                case TAKdenormalizegroup:
                    {
                        filteredRight.kill();
                        while (right.isItem(rightIndex))
                        {
                            if (!matchedRight.item(rightIndex))
                                filteredRight.append(right.item(rightIndex));
                            rightIndex++;
                        }
                        state = JSfillright;
                        if (filteredRight.ordinality())
                        {
                            const void * ret = groupDenormalizeRecords(defaultLeft, filteredRight, 0);
                            filteredRight.kill();

                            if (ret)
                            {
                                processed++;
                                return ret;
                            }
                        }
                        break;
                    }
                default:
                    throwUnexpected();
                }
            }
            state = JSfillright;
            break;
            
        case JSleftonly:
        {
            const void * ret = NULL;
            if (!matchedLeft && leftOuterJoin)
            {
                switch (kind)
                {
                case TAKjoin:
                    ret = joinRecords(left, defaultRight, 0, JTFmatchedleft);
                    break;
                case TAKdenormalize:
                    ret = left.getClear();
                    break;
                case TAKdenormalizegroup:
                    filteredRight.kill();
                    ret = groupDenormalizeRecords(left, filteredRight, JTFmatchedleft);
                    break;
                default:
                    throwUnexpected();
                }
            }
            left.clear();
            state = JSfillleft;
            if (ret)
            {
                processed++;
                return ret;
            }
            break;
        }

        case JScompare:
            if (joinLimit != 0)
            {
                switch (kind)
                {
                case TAKjoin:
                    {
                        while (right.isItem(rightIndex))
                        {
                            const void * rhs = right.item(rightIndex++);
                            if (helper.match(left, rhs))
                            {
                                matchedRight.replace(true, rightIndex-1);
                                matchedLeft = true;
                                if (!exclude)
                                {
                                    const void *ret = joinRecords(left, rhs, ++joinCounter, JTFmatchedleft|JTFmatchedright);
                                    if (ret)
                                    {
                                        processed++;
                                        joinLimit--;
                                        return ret;
                                    }
                                }
                            }
                        }
                        break;
                    }
                case TAKdenormalize:
                    {
                        OwnedConstRoxieRow newLeft;
                        newLeft.set(left);
                        unsigned rowSize = 0;
                        unsigned leftCount = 0;
                        while (right.isItem(rightIndex) && joinLimit)
                        {
                            const void * rhs = right.item(rightIndex++);
                            if (helper.match(left, rhs))
                            {
                                matchedRight.replace(true, rightIndex-1);
                                matchedLeft = true;
                                if (!exclude)
                                {
                                    try
                                    {
                                        RtlDynamicRowBuilder rowBuilder(rowAllocator);
                                        unsigned thisSize = helper.transform(rowBuilder, newLeft, rhs, ++leftCount, JTFmatchedleft|JTFmatchedright);
                                        if (thisSize)
                                        {
                                            rowSize = thisSize;
                                            newLeft.setown(rowBuilder.finalizeRowClear(rowSize));
                                            joinLimit--;
                                        }
                                    }
                                    catch(IException * e)
                                    {
                                        throw makeWrappedException(e);
                                    }
                                }
                            }
                        }
                        state = JSleftonly;
                        rightIndex = 0;
                        if (rowSize)
                        {
                            processed++;
                            return newLeft.getClear();
                        }
                        break;
                    }
                case TAKdenormalizegroup:
                    {
                        filteredRight.kill();
                        while (right.isItem(rightIndex))
                        {
                            const void * rhs = right.item(rightIndex++);
                            if (helper.match(left, rhs))
                            {
                                matchedRight.replace(true, rightIndex-1);
                                filteredRight.append(rhs);
                                matchedLeft = true;
                                if (filteredRight.ordinality()==joinLimit)
                                    break;
                            }
                        }
                        state = JSleftonly;
                        rightIndex = 0;

                        if (!exclude && filteredRight.ordinality())
                        {
                            const void * ret = groupDenormalizeRecords(left, filteredRight, JTFmatchedleft);
                            filteredRight.kill();

                            if (ret)
                            {
                                processed++;
                                return ret;
                            }
                        }
                        break;
                    }
                default:
                    throwUnexpected();
                }
            }
            state = JSleftonly;
            rightIndex = 0;
            joinCounter = 0;
            break;
        }
    }
}

bool CHThorJoinActivity::isGrouped()
{
    return false;
}

//=====================================================================================================

CHThorSelfJoinActivity::CHThorSelfJoinActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorJoinArg &_arg, ThorActivityKind _kind, EclGraph & _graph)
        : CHThorActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(_arg), outBuilder(NULL)
{
    dualCacheInput = NULL;
}

void CHThorSelfJoinActivity::ready()
{
    CHThorActivityBase::ready();
    outBuilder.setAllocator(rowAllocator);
    ICompare *compareLeft = helper.queryCompareLeft();
    if (helper.isLeftAlreadySorted())
        groupedInput.setown(createGroupedInputReader(&input->queryStream(), compareLeft));
    else
    {
        bool isStable = (helper.getJoinFlags() & JFunstable) == 0;
        RoxieSortAlgorithm sortAlgorithm = isStable ? stableSpillingQuickSortAlgorithm : spillingQuickSortAlgorithm;
        StringBuffer tempBase;
        agent.getTempfileBase(tempBase);
        groupedInput.setown(createSortedGroupedInputReader(&input->queryStream(), compareLeft, createSortAlgorithm(sortAlgorithm, compareLeft, *queryRowManager(), input->queryOutputMeta(), agent.queryCodeContext(), tempBase, activityId)));
    }
    leftOuterJoin = (helper.getJoinFlags() & JFleftouter) != 0;
    rightOuterJoin = (helper.getJoinFlags() & JFrightouter) != 0;
    exclude = (helper.getJoinFlags() & JFexclude) != 0;
    getLimitType(helper.getJoinFlags(), limitFail, limitOnFail);
    if (rightOuterJoin && !defaultLeft)
    {
        if (!defaultAllocator)                          
            defaultAllocator.setown(agent.queryCodeContext()->getRowAllocator(input->queryOutputMeta(), activityId));

        RtlDynamicRowBuilder rowBuilder(defaultAllocator);
        size32_t thisSize = helper.createDefaultLeft(rowBuilder);
        defaultLeft.setown(rowBuilder.finalizeRowClear(thisSize));
    }
    if ((leftOuterJoin || limitOnFail) && !defaultRight)
    {
        if (!defaultAllocator)                          
            defaultAllocator.setown(agent.queryCodeContext()->getRowAllocator(input->queryOutputMeta(), activityId));

        RtlDynamicRowBuilder rowBuilder(defaultAllocator);
        size32_t thisSize = helper.createDefaultRight(rowBuilder);
        defaultRight.setown(rowBuilder.finalizeRowClear(thisSize));
    }

    if((helper.getJoinFlags() & JFslidingmatch) != 0)
        throw MakeStringException(99, "Sliding self join not supported");
    keepLimit = helper.getKeepLimit();
    if(keepLimit == 0)
        keepLimit = (unsigned)-1;
    atmostLimit = helper.getJoinLimit();
    if(atmostLimit == 0)
        atmostLimit = (unsigned)-1;
    else
        assertex(!rightOuterJoin);
    abortLimit = helper.getMatchAbortLimit();
    if (abortLimit == 0) 
        abortLimit = (unsigned)-1;

    assertex((helper.getJoinFlags() & (JFfirst | JFfirstleft | JFfirstright)) == 0); // no longer supported

    collate = helper.queryCompareLeftRight();

    eof = false;
    doneFirstFill = false;
    failingLimit.clear();
    if ((helper.getJoinFlags() & JFlimitedprefixjoin) && helper.getJoinLimit()) 
    {   //Limited Match Join (s[1..n])
        dualcache.setown(new CRHDualCache());
        dualcache->init(groupedInput);
        dualCacheInput = dualcache->queryOut1();
        failingOuterAtmost = false;
        matchedLeft = false;
        leftIndex = 0;
        rightOuterIndex = 0;

        limitedhelper.setown(createRHLimitedCompareHelper());
        limitedhelper->init( helper.getJoinLimit(), dualcache->queryOut2(), collate, helper.queryPrefixCompare() );
    }
    joinCounter = 0;
}

void CHThorSelfJoinActivity::stop()
{
    outBuilder.clear();
    group.clear();
    groupedInput.clear();
    CHThorActivityBase::stop();
}

bool CHThorSelfJoinActivity::fillGroup()
{
    group.clear();
    matchedLeft = false;
    matchedRight.kill();
    failingOuterAtmost = false;
    OwnedConstRoxieRow next;
    unsigned groupCount = 0;
    next.setown(groupedInput->nextRow());
    while(next)
    {
        if(groupCount==abortLimit)
        {
            if(limitFail)
                failLimit(next);
            if ( agent.queryCodeContext()->queryDebugContext())
                agent.queryCodeContext()->queryDebugContext()->checkBreakpoint(DebugStateLimit, NULL, static_cast<IActivityBase *>(this));
            if(limitOnFail)
            {
                assertex(!failingLimit);
                try
                {
                    failLimit(next);
                }
                catch(IException * except)
                {
                    failingLimit.setown(except);
                }
                assertex(failingLimit);
                group.append(next.getClear());
                groupCount++;
                break;
            }
            group.clear();
            groupCount = 0;
            while(next) 
                next.setown(groupedInput->nextRow());
        }
        else if(groupCount==atmostLimit)
        {
            if(leftOuterJoin)
            {
                group.append(next.getClear());
                groupCount++;
                failingOuterAtmost = true;
                break;
            }
            else
            {
                group.clear();
                groupCount = 0;
                while(next) 
                    next.setown(groupedInput->nextRow());
            }
        }
        else
        {
            group.append(next.getClear());
            groupCount++;
        }
        next.setown(groupedInput->nextRow());
    }
    if(group.ordinality()==0)
    {
        eof = true;
        return false;
    }
    leftIndex = 0;
    rightIndex = 0;
    joinCounter = 0;
    rightOuterIndex = 0;
    joinLimit = keepLimit;
    ForEachItemIn(idx, group)
        matchedRight.append(false);
    return true;
}

const void * CHThorSelfJoinActivity::nextRow()
{
    if (limitedhelper)  {
        while(!eof) //limited match join
        {
            if (!group.isItem(rightIndex))
            {
                lhs.setown(dualCacheInput->nextRow());
                if (lhs)
                {
                    rightIndex = 0;
                    joinCounter = 0;
                    group.clear();
                    limitedhelper->getGroup(group,lhs);
                }
                else 
                    eof = true;
            }

            if (group.isItem(rightIndex))
            {
                const void * rhs = group.item(rightIndex++);
                if(helper.match(lhs, rhs))
                {
                    const void * ret = joinRecords(lhs, rhs, ++joinCounter, JTFmatchedleft|JTFmatchedright, NULL);
                    if(ret)
                    {
                        processed++;
                        return ret;
                    }
                }
            }
        }
        return NULL;
    }

    if(!doneFirstFill)
    {
        fillGroup();
        doneFirstFill = true;
    }
    while(!eof)
    {
        if(failingOuterAtmost)
            while(group.isItem(leftIndex))
            {
                const void * ret = joinRecords(group.item(leftIndex++), defaultRight, 0, JTFmatchedleft, NULL);
                if(ret)
                {
                    processed++;
                    return ret;
                }
            }
        if((joinLimit == 0) || !group.isItem(rightIndex))
        {
            if(leftOuterJoin && !matchedLeft && !failingLimit)
            {
                const void * ret = joinRecords(group.item(leftIndex), defaultRight, 0, JTFmatchedleft, NULL);
                if(ret)
                {
                    matchedLeft = true;
                    processed++;
                    return ret;
                }
            }
            leftIndex++;
            matchedLeft = false;
            rightIndex = 0;
            joinCounter = 0;
            joinLimit = keepLimit;
        }
        if(!group.isItem(leftIndex))
        {
            if(failingLimit || failingOuterAtmost)
            {
                OwnedConstRoxieRow lhs(groupedInput->nextRow());  // dualCache never active here
                while(lhs)
                {
                    const void * ret = joinRecords(lhs, defaultRight, 0, JTFmatchedleft, failingLimit);
                    if(ret)
                    {
                        processed++;
                        return ret;
                    }
                    lhs.setown(groupedInput->nextRow());
                }
                failingLimit.clear();
            }
            if(rightOuterJoin && !failingLimit)
                while(group.isItem(rightOuterIndex))
                    if(!matchedRight.item(rightOuterIndex++))
                    {
                        const void * ret = joinRecords(defaultLeft, group.item(rightOuterIndex-1), 0, JTFmatchedright, NULL);
                        if(ret)
                        {
                            processed++;
                            return ret;
                        }
                    }
            if(!fillGroup())
                return NULL;
            continue;
        }
        const void * lhs = group.item(leftIndex);
        if(failingLimit)
        {
            leftIndex++;
            const void * ret = joinRecords(lhs, defaultRight, 0, JTFmatchedleft, failingLimit);
            if(ret)
            {
                processed++;
                return ret;
            }
        }
        else
        {
            const void * rhs = group.item(rightIndex++);
            if(helper.match(lhs, rhs))
            {
                matchedLeft = true;
                matchedRight.replace(true, rightIndex-1);
                if(!exclude)
                {
                    const void * ret = joinRecords(lhs, rhs, ++joinCounter, JTFmatchedleft|JTFmatchedright, NULL);
                    if(ret)
                    {
                        processed++;
                        joinLimit--;
                        return ret;
                    }
                }
            }
        }
    }
    return NULL;
}

const void * CHThorSelfJoinActivity::joinRecords(const void * curLeft, const void * curRight, unsigned counter, unsigned flags, IException * except)
{
    outBuilder.ensureRow();
    try
    {
            size32_t thisSize = (except ? helper.onFailTransform(outBuilder, curLeft, curRight, except, flags) : helper.transform(outBuilder, curLeft, curRight, counter, flags));
            if(thisSize){
                return outBuilder.finalizeRowClear(thisSize);   
            }
            else
                return NULL;
    }
    catch(IException * e)
    {
        throw makeWrappedException(e);
    }
}

void CHThorSelfJoinActivity::failLimit(const void * next)
{
    helper.onMatchAbortLimitExceeded();
    CommonXmlWriter xmlwrite(0);
    if (input->queryOutputMeta() && input->queryOutputMeta()->hasXML())
    {
        input->queryOutputMeta()->toXML((byte *) next, xmlwrite);
    }
    throw MakeStringException(0, "More than %d match candidates in self-join for row %s", abortLimit, xmlwrite.str());
}

bool CHThorSelfJoinActivity::isGrouped()
{
    return false;
}

//=====================================================================================================

CHThorLookupJoinActivity::LookupTable::LookupTable(unsigned _size, ICompare * _leftRightCompare, ICompare * _rightCompare, IHash * _leftHash, IHash * _rightHash, bool _dedupOnAdd)
    : leftRightCompare(_leftRightCompare), rightCompare(_rightCompare), leftHash(_leftHash), rightHash(_rightHash), dedupOnAdd(_dedupOnAdd)
{
    unsigned minsize = (4*_size)/3;
    size = 2;
    while((minsize >>= 1) > 0)
        size <<= 1;
    mask = size - 1;
    table = new OwnedConstRoxieRow[size];
    findex = BadIndex;
}

CHThorLookupJoinActivity::LookupTable::~LookupTable()
{
    delete [] table;
}

bool CHThorLookupJoinActivity::LookupTable::add(const void * _right)
{
    OwnedConstRoxieRow right(_right);
    findex = BadIndex;
    unsigned start = rightHash->hash(right) & mask;
    unsigned index = start;
    while(table[index])
    {
        if(dedupOnAdd && (rightCompare->docompare(table[index], right) == 0))
            return false;
        index++;
        if(index==size)
            index = 0;
        if(index==start)
            return false; //table is full, should never happen
    }
    table[index].setown(right.getClear());
    return true;
}

const void * CHThorLookupJoinActivity::LookupTable::find(const void * left) const
{
    fstart = leftHash->hash(left) & mask;
    findex = fstart;
    return doFind(left);
}

const void * CHThorLookupJoinActivity::LookupTable::findNext(const void * left) const
{
    if(findex == BadIndex)
        return NULL;
    advance();
    return doFind(left);
}

void CHThorLookupJoinActivity::LookupTable::advance() const
{
    findex++;
    if(findex==size)
        findex = 0;
    if(findex==fstart)
        throw MakeStringException(0, "Internal error hthor lookup join activity (hash table full on lookup)");
}

const void * CHThorLookupJoinActivity::LookupTable::doFind(const void * left) const
{
    while(table[findex])
    {
        if(leftRightCompare->docompare(left, table[findex]) == 0)
            return table[findex];
        advance();
    }
    findex = BadIndex;
    return NULL;
}

CHThorLookupJoinActivity::CHThorLookupJoinActivity(IAgentContext & _agent, unsigned _activityId, unsigned _subgraphId, IHThorHashJoinArg &_arg, ThorActivityKind _kind, EclGraph & _graph)
 : CHThorActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(_arg), outBuilder(NULL), table(0)
{
}

void CHThorLookupJoinActivity::ready()
{
    CHThorActivityBase::ready();
    input1->ready();
    outBuilder.setAllocator(rowAllocator);

    leftOuterJoin = (helper.getJoinFlags() & JFleftouter) != 0;
    assertex((helper.getJoinFlags() & JFrightouter) == 0);
    exclude = (helper.getJoinFlags() & JFexclude) != 0;
    many = (helper.getJoinFlags() & JFmanylookup) != 0;
    dedupRHS = (helper.getJoinFlags() & (JFmanylookup | JFmatchrequired | JFtransformMaySkip)) == 0; // optimisation: can implicitly dedup RHS unless is many lookup, or match required, or transform may skip
    if((helper.getJoinFlags() & (JFfirst | JFfirstleft | JFfirstright | JFslidingmatch)) != 0)
        throwUnexpected();  // compiler should have rejected

    keepLimit = helper.getKeepLimit();
    if(keepLimit==0)
        keepLimit = static_cast<unsigned>(-1);
    atmostLimit = helper.getJoinLimit();
    limitLimit = helper.getMatchAbortLimit();
    hasGroupLimit = ((atmostLimit > 0) || (limitLimit > 0));
    if(atmostLimit==0)
        atmostLimit = static_cast<unsigned>(-1);
    if(limitLimit==0)
        limitLimit = static_cast<unsigned>(-1);
    isSmartJoin = (helper.getJoinFlags() & JFsmart) != 0;
    getLimitType(helper.getJoinFlags(), limitFail, limitOnFail);

    if((leftOuterJoin || limitOnFail) && !defaultRight)
        createDefaultRight();   
    eog = false;
    matchedGroup = false;
    joinCounter = 0;
}

void CHThorLookupJoinActivity::stop()
{
    outBuilder.clear();
    left.clear();
    table.clear();
    CHThorActivityBase::stop();
    input1->stop();
}

void CHThorLookupJoinActivity::createDefaultRight()
{
    if (!defaultRight)
    {
        if (!defaultRightAllocator)
            defaultRightAllocator.setown(agent.queryCodeContext()->getRowAllocator(input1->queryOutputMeta(), activityId));

        RtlDynamicRowBuilder rowBuilder(defaultRightAllocator);
        size32_t thisSize = helper.createDefaultRight(rowBuilder);
        defaultRight.setown(rowBuilder.finalizeRowClear(thisSize));
    }
}

void CHThorLookupJoinActivity::loadRight()
{
    OwnedRowArray rightset;
    const void * next;
    while(true)
    {
        next = input1->nextRow();
        if(!next)
            next = input1->nextRow();
        if(!next)
            break;
        rightset.append(next);
    }

    unsigned rightord = rightset.ordinality();
    table.setown(new LookupTable(rightord, helper.queryCompareLeftRight(), helper.queryCompareRight(), helper.queryHashLeft(), helper.queryHashRight(), dedupRHS));

    unsigned i;
    for(i=0; i<rightord; i++)
        table->add(rightset.itemClear(i));
};

void CHThorLookupJoinActivity::setInput(unsigned index, IHThorInput * _input)
{
    if (index==1)
        input1 = _input;
    else
        CHThorActivityBase::setInput(index, _input);
}

//following are all copied from CHThorJoinActivity - should common up.
const void * CHThorLookupJoinActivity::joinRecords(const void * left, const void * right, unsigned counter, unsigned flags)
{
    try
    {
        outBuilder.ensureRow();
        size32_t thisSize = helper.transform(outBuilder, left, right, counter, flags);
        if(thisSize)
            return outBuilder.finalizeRowClear(thisSize);
        else
            return NULL;
    }
    catch(IException * e)
    {
        throw makeWrappedException(e);
    }
}

const void * CHThorLookupJoinActivity::joinException(const void * left, IException * except)
{
    try
    {
        outBuilder.ensureRow();
        memsize_t thisSize = helper.onFailTransform(outBuilder, left, defaultRight, except, JTFmatchedleft);
        if(thisSize)
            return outBuilder.finalizeRowClear(thisSize);
        else
            return NULL;
    }
    catch(IException * e)
    {
        throw makeWrappedException(e);
    }
}

const void * CHThorLookupJoinActivity::groupDenormalizeRecords(const void * left, ConstPointerArray & rows, unsigned flags)
{
    try
    {
        outBuilder.ensureRow();
        unsigned numRows = rows.ordinality();
        const void * right = numRows ? rows.item(0) : defaultRight.get();
        if (numRows>0)
            flags |= JTFmatchedright;
        memsize_t thisSize = helper.transform(outBuilder, left, right, numRows, (const void * *)rows.getArray(), flags);
        if(thisSize)
            return outBuilder.finalizeRowClear(thisSize);
        else
            return NULL;
    }
    catch(IException * e)
    {
        throw makeWrappedException(e);
    }
}

const void * CHThorLookupJoinActivity::nextRow()
{
    if(!table)
        loadRight();
    switch (kind)
    {
    case TAKlookupjoin:
    case TAKsmartjoin:
        return nextRowJoin();
    case TAKlookupdenormalize:
    case TAKlookupdenormalizegroup:
    case TAKsmartdenormalize:
    case TAKsmartdenormalizegroup:
        return nextRowDenormalize();
    }
    throwUnexpected();
}

const void * CHThorLookupJoinActivity::nextRowJoin()
{
    while(true)
    {
        const void * right = NULL;
        if(!left)
        {
            left.setown(input->nextRow());
            keepCount = keepLimit;
            if(!left)
            {
                if (isSmartJoin)
                    left.setown(input->nextRow());

                if(!left)
                {
                    if(matchedGroup || eog)
                    {
                        matchedGroup = false;
                        eog = true;
                        return NULL;
                    }
                    eog = true;
                    continue;
                }
            }
            eog = false;
            gotMatch = false;
            right = getRightFirst();
        }
        else
            right = getRightNext();
        const void * ret = NULL;
        if(failingLimit)
        {
            ret = joinException(left, failingLimit);
        }
        else
        {
            while(right)
            {
                if(helper.match(left, right))
                {
                    gotMatch = true;
                    if(exclude)
                        break;
                    ret = joinRecords(left, right, ++joinCounter, JTFmatchedleft|JTFmatchedright);
                    if(ret)
                    {
                        processed++;
                        break;
                    }
                }
                right = getRightNext();
                ret = NULL;
            }
            if(leftOuterJoin && !gotMatch)
            {
                ret = joinRecords(left, defaultRight, 0, JTFmatchedleft);
                gotMatch = true;
            }
        }
        if(ret)
        {
            matchedGroup = true;
            processed++;
            if(!many || (--keepCount == 0) || failingLimit)
            {
                left.clear();
                joinCounter = 0;
                failingLimit.clear();
            }
            return ret;
        }
        left.clear();
        joinCounter = 0;
    }
}

const void * CHThorLookupJoinActivity::nextRowDenormalize()
{
    while(true)
    {
        left.setown(input->nextRow());
        if(!left)
        {
            if (!matchedGroup || isSmartJoin)
                left.setown(input->nextRow());

            if (!left)
            {
                matchedGroup = false;
                return NULL;
            }
        }
        gotMatch = false;

        const void * right = getRightFirst();
        const void * ret = NULL;
        if (failingLimit)
            ret = joinException(left, failingLimit);
        else if (kind == TAKlookupdenormalize || kind == TAKsmartdenormalize)
        {
            OwnedConstRoxieRow newLeft(left.getLink());
            unsigned rowSize = 0;
            unsigned leftCount = 0;
            keepCount = keepLimit;
            while (right)
            {
                if (helper.match(left, right))
                {
                    gotMatch = true;
                    if (exclude)
                        break;

                    try
                    {
                        RtlDynamicRowBuilder rowBuilder(rowAllocator);
                        unsigned thisSize = helper.transform(rowBuilder, newLeft, right, ++leftCount, JTFmatchedleft|JTFmatchedright);
                        if (thisSize)
                        {
                            rowSize = thisSize;
                            newLeft.setown(rowBuilder.finalizeRowClear(rowSize));
                        }
                    }
                    catch(IException * e)
                    {
                        throw makeWrappedException(e);
                    }
                    if(!many || (--keepCount == 0))
                        break;
                }
                right = getRightNext();
            }
            //Is this rowSize test correct??  Is there any situation where it shouldn't just return newLeft?
            if (rowSize)
                ret = newLeft.getClear();
            else if (leftOuterJoin && !gotMatch)
                ret = left.getClear();
        }
        else
        {
            filteredRight.kill();
            keepCount = keepLimit;
            while (right)
            {
                if (helper.match(left, right))
                {
                    gotMatch = true;
                    if(exclude)
                        break;
                    filteredRight.append(right);
                    if(!many || (--keepCount == 0))
                        break;
                }
                right = getRightNext();
            }

            if((filteredRight.ordinality() > 0) || (leftOuterJoin && !gotMatch))
                ret = groupDenormalizeRecords(left, filteredRight, JTFmatchedleft);
            filteredRight.kill();
        }
        left.clear();
        failingLimit.clear();
        if(ret)
        {
            matchedGroup = true;
            processed++;
            return ret;
        }
    }
}


bool CHThorLookupJoinActivity::isGrouped()
{
    return input ? input->isGrouped() : false;
}

const void * CHThorLookupJoinActivity::fillRightGroup()
{
    rightGroup.kill();
    for(const void * right = table->find(left); right; right = table->findNext(left))
    {
        rightGroup.append(right);
        if(rightGroup.ordinality() > limitLimit)
        {
            if(limitFail)
                failLimit();
            if ( agent.queryCodeContext()->queryDebugContext())
                agent.queryCodeContext()->queryDebugContext()->checkBreakpoint(DebugStateLimit, NULL, static_cast<IActivityBase *>(this));
            gotMatch = true;
            if(limitOnFail)
            {
                assertex(!failingLimit);
                try
                {
                    failLimit();
                }
                catch(IException * e)
                {
                    failingLimit.setown(e);
                }
                assertex(failingLimit);
            }
            else
            {
                rightGroup.kill();
            }
            break;
        }
        if(rightGroup.ordinality() > atmostLimit)
        {
            rightGroup.kill();
            break;
        }
    }
    rightGroupIndex = 0;
    return readRightGroup();
}

void CHThorLookupJoinActivity::failLimit()
{
    helper.onMatchAbortLimitExceeded();
    CommonXmlWriter xmlwrite(0);
    if(input->queryOutputMeta() && input->queryOutputMeta()->hasXML())
    {
        input->queryOutputMeta()->toXML(static_cast<const unsigned char *>(left.get()), xmlwrite);
    }
    throw MakeStringException(0, "More than %u match candidates in join for row %s", limitLimit, xmlwrite.str());
}

unsigned const CHThorLookupJoinActivity::LookupTable::BadIndex(static_cast<unsigned>(-1));

//=====================================================================================================

CHThorAllJoinActivity::CHThorAllJoinActivity(IAgentContext & _agent, unsigned _activityId, unsigned _subgraphId, IHThorAllJoinArg &_arg, ThorActivityKind _kind, EclGraph & _graph) : CHThorActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(_arg), outBuilder(NULL)
{
}

void CHThorAllJoinActivity::ready()
{
    CHThorActivityBase::ready();
    input1->ready();
    outBuilder.setAllocator(rowAllocator);

    leftOuterJoin = (helper.getJoinFlags() & JFleftouter) != 0;
    exclude = (helper.getJoinFlags() & JFexclude) != 0;
    if(leftOuterJoin && !defaultRight)
        createDefaultRight();   
    if((helper.getJoinFlags() & (JFrightouter | JFfirst | JFfirstleft | JFfirstright)) != 0)
        throwUnexpected();

    keepLimit = helper.getKeepLimit();
    if(keepLimit==0)
        keepLimit = (unsigned)-1;

    started = false;
    countForLeft = keepLimit;
    matchedLeft = false;
    matchedGroup = false;
    eog = false;
    eos = false;
}

void CHThorAllJoinActivity::stop()
{
    outBuilder.clear();
    left.clear();
    rightset.clear();
    matchedRight.kill();
    CHThorActivityBase::stop();
    input1->stop();
}

void CHThorAllJoinActivity::createDefaultRight()
{
    if (!defaultRight)
    {
        if (!defaultRightAllocator)
            defaultRightAllocator.setown(agent.queryCodeContext()->getRowAllocator(input1->queryOutputMeta(), activityId));

        RtlDynamicRowBuilder rowBuilder(defaultRightAllocator);
        size32_t thisSize = helper.createDefaultRight(rowBuilder);
        defaultRight.setown(rowBuilder.finalizeRowClear(thisSize));
    }
}

void CHThorAllJoinActivity::loadRight()
{
    const void * next;
    while(true)
    {
        next = input1->nextRow();
        if(!next)
            next = input1->nextRow();
        if(!next)
            break;
        rightset.append(next);
        matchedRight.append(false);
    }
    rightIndex = 0;
    joinCounter = 0;
    rightOrdinality = rightset.ordinality();
}

const void * CHThorAllJoinActivity::joinRecords(const void * left, const void * right, unsigned counter, unsigned flags)
{
    try
    {
        outBuilder.ensureRow();
        memsize_t thisSize = helper.transform(outBuilder, left, right, counter, flags);
        if(thisSize)
            return outBuilder.finalizeRowClear(thisSize);
        else
            return NULL;
    }
    catch(IException * e)
    {
        throw makeWrappedException(e);
    }
}

const void * CHThorAllJoinActivity::groupDenormalizeRecords(const void * curLeft, ConstPointerArray & rows, unsigned flags)
{
    try
    {
        outBuilder.ensureRow();
        unsigned numRows = rows.ordinality();
        const void * right = numRows ? rows.item(0) : defaultRight.get();
        if (numRows>0)
            flags |= JTFmatchedright;
        memsize_t thisSize = helper.transform(outBuilder, curLeft, right, numRows, (const void * *)rows.getArray(), flags);
        if(thisSize)
            return outBuilder.finalizeRowClear(thisSize);
        else
            return NULL;
    }
    catch(IException * e)
    {
        throw makeWrappedException(e);
    }
}

void CHThorAllJoinActivity::setInput(unsigned index, IHThorInput * _input)
{
    if (index==1)
        input1 = _input;
    else
    {
        CHThorActivityBase::setInput(index, _input);
        leftIsGrouped = true; // input->isGrouped() is unreliable and it is just as good to always behave as if input is grouped
    }
}

const void * CHThorAllJoinActivity::nextRow()
{
    if(!started)
    {
        started = true;
        left.setown(input->nextRow());
        matchedLeft = false;
        countForLeft = keepLimit;
        if(!left)
        {
            eos = true;
            return NULL;
        }
        loadRight();
    }

    const void * ret;   
    const void * right;
    if(eos)
        return NULL;

    while(true)
    {
        ret = NULL;

        if((rightIndex == rightOrdinality) || (countForLeft==0))
        {
            if(leftOuterJoin && left && !matchedLeft)
            {
                switch(kind)
                {
                case TAKalljoin:
                    ret = joinRecords(left, defaultRight, 0, JTFmatchedleft);
                    break;
                case TAKalldenormalize:
                    ret = left.getClear();
                    break;
                case TAKalldenormalizegroup:
                    filteredRight.kill();
                    ret = groupDenormalizeRecords(left, filteredRight, JTFmatchedleft);
                    break;
                default:
                    throwUnexpected();
                }
            }
            rightIndex = 0;
            joinCounter = 0;
            left.clear();
            if(ret)
            {
                matchedGroup = true;
                processed++;
                return ret;
            }
        }

        if(!left)
        {
            left.setown(input->nextRow());
            matchedLeft = false;
            countForLeft = keepLimit;
        }
        if(!left)
        {
            if(eog)
            {
                eos = true;
                matchedGroup = false;
                return NULL;
            }
            eog = true;
            if(matchedGroup && leftIsGrouped)
            {
                matchedGroup = false;
                return NULL;
            }
            matchedGroup = false;
            continue;
        }

        eog = false;
        switch(kind)
        {
        case TAKalljoin:
            while(rightIndex < rightOrdinality)
            {
                right = rightset.item(rightIndex);
                if(helper.match(left, right))
                {
                    matchedLeft = true;
                    matchedRight.replace(true, rightIndex);
                    if(!exclude)
                        ret = joinRecords(left, right, ++joinCounter, JTFmatchedleft|JTFmatchedright);
                }
                rightIndex++;
                if(ret)
                {
                    countForLeft--;
                    matchedGroup = true;
                    processed++;
                    return ret;
                }
            }
        case TAKalldenormalize:
            {
                OwnedConstRoxieRow newLeft;
                newLeft.set(left);
                unsigned rowSize = 0;
                unsigned leftCount = 0;
                while((rightIndex < rightOrdinality) && countForLeft)
                {
                    right = rightset.item(rightIndex);
                    if(helper.match(left, right))
                    {
                        matchedLeft = true;
                        matchedRight.replace(true, rightIndex);
                        if(!exclude)
                        {
                            try
                            {
                                RtlDynamicRowBuilder rowBuilder(rowAllocator);
                                unsigned thisSize = helper.transform(rowBuilder, newLeft, right, ++leftCount, JTFmatchedleft|JTFmatchedright);
                                if(thisSize)
                                {
                                    rowSize = thisSize;
                                    newLeft.setown(rowBuilder.finalizeRowClear(rowSize));
                                    --countForLeft;
                                }
                            }
                            catch(IException * e)
                            {
                                throw makeWrappedException(e);
                            }
                        }
                    }
                    rightIndex++;
                }
                if(rowSize)
                {
                    processed++;
                    return newLeft.getClear();
                }
            }
            break;
        case TAKalldenormalizegroup:
            filteredRight.kill();
            while((rightIndex < rightOrdinality) && countForLeft)
            {
                right = rightset.item(rightIndex);
                if(helper.match(left, right))
                {
                    matchedLeft = true;
                    matchedRight.replace(true, rightIndex);
                    filteredRight.append(right);
                    --countForLeft;
                }
                ++rightIndex;
            }
            if(!exclude && filteredRight.ordinality())
            {
                const void * ret = groupDenormalizeRecords(left, filteredRight, JTFmatchedleft);
                filteredRight.kill();
                if(ret)
                {
                    processed++;
                    return ret;
                }
            }
            break;
        default:
            throwUnexpected();
        }
    }
}

bool CHThorAllJoinActivity::isGrouped()
{
    return input ? input->isGrouped() : false;
}

//=====================================================================================================
//=====================================================================================================

CHThorWorkUnitWriteActivity::CHThorWorkUnitWriteActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorWorkUnitWriteArg &_arg, ThorActivityKind _kind, EclGraph & _graph)
 : CHThorActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(_arg)
{
}

static void throwWuResultTooLarge(size32_t outputLimit, IHThorWorkUnitWriteArg &helper)
{
    StringBuffer errMsg("Dataset too large to output to workunit (limit "); 
    errMsg.append(outputLimit/0x100000).append(" megabytes), in result (");
    const char *name = helper.queryName();
    if (name)
        errMsg.append("name=").append(name);
    else
        errMsg.append("sequence=").append(helper.getSequence());
    errMsg.append(")");
    throw MakeStringExceptionDirect(0, errMsg.str());
}

void CHThorWorkUnitWriteActivity::execute()
{
    unsigned flags = helper.getFlags();
    grouped = (POFgrouped & flags) != 0;
    // In absense of OPT_OUTPUTLIMIT check pre 5.2 legacy name OPT_OUTPUTLIMIT_LEGACY
    size32_t outputLimit = agent.queryWorkUnit()->getDebugValueInt(OPT_OUTPUTLIMIT, agent.queryWorkUnit()->getDebugValueInt(OPT_OUTPUTLIMIT_LEGACY, defaultDaliResultLimit));
    if (flags & POFmaxsize)
        outputLimit = helper.getMaxSize();
    if (outputLimit>daliResultOutputMax)
        throw MakeStringException(0, "Dali result outputs are restricted to a maximum of %d MB, the current limit is %d MB. A huge dali result usually indicates the ECL needs altering.", daliResultOutputMax, defaultDaliResultLimit);
    assertex(outputLimit<=0x1000); // 32bit limit because MemoryBuffer/CMessageBuffers involved etc.
    outputLimit *= 0x100000;
    MemoryBuffer rowdata;
    __int64 rows = 0;
    IRecordSize * inputMeta = input->queryOutputMeta();
    if (0 != (POFextend & helper.getFlags()))
    {
        WorkunitUpdate w = agent.updateWorkUnit();
        Owned<IWUResult> result = updateWorkUnitResult(w, helper.queryName(), helper.getSequence());
        rows = result->getResultRowCount();
    }
    __int64 initialRows = rows;

    Owned<IOutputRowSerializer> rowSerializer;
    if (input->queryOutputMeta()->getMetaFlags() & MDFneedserializedisk)
        rowSerializer.setown( input->queryOutputMeta()->createDiskSerializer(agent.queryCodeContext(), activityId) );

    int seq = helper.getSequence();
    bool toStdout = (seq >= 0) && agent.queryWriteResultsToStdout();
    Owned<SimpleOutputWriter> writer;
    if (toStdout)
        writer.setown(new SimpleOutputWriter);

    if (agent.queryOutputFmt() == ofXML  && seq >= 0)
    {
        StringBuffer sb;
        const char *name = helper.queryName();
        if (name && *name)
            sb.appendf("<Dataset name='%s'>\n", name);
        else
            sb.appendf("<Dataset name='Result %d'>\n", seq+1);
        agent.queryOutputSerializer()->fwrite(seq, (const void*)sb.str(), 1, sb.length());
    }
    for (;;)
    {
        if ((unsigned __int64)rows >= agent.queryStopAfter())
            break;
        OwnedConstRoxieRow nextrec(input->nextRow());
        if (grouped && (rows != initialRows))
            rowdata.append(nextrec == NULL);
        if (!nextrec)
        {
            nextrec.setown(input->nextRow());
            if (!nextrec)
                break;
        }
        size32_t thisSize = inputMeta->getRecordSize(nextrec);
        if (outputLimit && ((rowdata.length() + thisSize) > outputLimit))
            throwWuResultTooLarge(outputLimit, helper);
        if (rowSerializer)
        {
            CThorDemoRowSerializer serializerTarget(rowdata);
            rowSerializer->serialize(serializerTarget, (const byte *) nextrec.get() );
        }
        else
            rowdata.append(thisSize, nextrec);
        if (toStdout && seq >= 0)
        {
            if (agent.queryOutputFmt() == ofSTD)
            {
                helper.serializeXml((byte *) nextrec.get(), *writer);
                writer->newline();
                agent.queryOutputSerializer()->fwrite(seq, (const void*)writer->str(), 1, writer->length());
                writer->clear();
            }
            else if (agent.queryOutputFmt() == ofXML)
            {
                CommonXmlWriter xmlwrite(0,1);
                xmlwrite.outputBeginNested(DEFAULTXMLROWTAG, false);
                helper.serializeXml((byte *) nextrec.get(), xmlwrite);
                xmlwrite.outputEndNested(DEFAULTXMLROWTAG);
                agent.queryOutputSerializer()->fwrite(seq, (const void*)xmlwrite.str(), 1, xmlwrite.length());
            }
        }
        rows++;
    }
    WorkunitUpdate w = agent.updateWorkUnit();
    Owned<IWUResult> result = updateWorkUnitResult(w, helper.queryName(), helper.getSequence());
    if (0 != (POFextend & helper.getFlags()))
    {
        __int64 existingSz = result->getResultRawSize(nullptr, nullptr);
        if (outputLimit && ((rowdata.length() + existingSz) > outputLimit))
            throwWuResultTooLarge(outputLimit, helper);
        result->addResultRaw(rowdata.length(), rowdata.toByteArray(), ResultFormatRaw);
    }
    else
        result->setResultRaw(rowdata.length(), rowdata.toByteArray(), ResultFormatRaw);
    result->setResultStatus(ResultStatusCalculated);
    result->setResultRowCount(rows);
    result->setResultTotalRowCount(rows); // Is this right??
    if (toStdout && seq >= 0)
    {
        if (agent.queryOutputFmt() == ofXML)
        {
            StringBuffer sb;
            sb.appendf(DEFAULTXMLFOOTER).newline();
            agent.queryOutputSerializer()->fwrite(seq, (const void*)sb.str(), 1, sb.length());
        }
        else if (agent.queryOutputFmt() != ofSTD)
            agent.outputFormattedResult(helper.queryName(), seq, false);

        if (!(POFextend & helper.getFlags()))//POextend results will never get closed, so wont flush until serializer dtor
            agent.queryOutputSerializer()->close(seq, false);
    }
}

//=====================================================================================================

CHThorDictionaryWorkUnitWriteActivity::CHThorDictionaryWorkUnitWriteActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorDictionaryWorkUnitWriteArg &_arg, ThorActivityKind _kind, EclGraph & _graph)
 : CHThorActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(_arg)
{
}

void CHThorDictionaryWorkUnitWriteActivity::execute()
{
    int sequence = helper.getSequence();
    const char *storedName = helper.queryName();
    assertex(storedName && *storedName);
    assertex(sequence < 0);

    RtlLinkedDictionaryBuilder builder(rowAllocator, helper.queryHashLookupInfo());
    for (;;)
    {
        const void *row = input->nextRow();
        if (!row)
        {
            row = input->nextRow();
            if (!row)
                break;
        }
        builder.appendOwn(row);
        processed++;
    }
    unsigned __int64 usedCount = rtlDictionaryCount(builder.getcount(), builder.queryrows());

    // In absense of OPT_OUTPUTLIMIT check pre 5.2 legacy name OPT_OUTPUTLIMIT_LEGACY
    size32_t outputLimit = agent.queryWorkUnit()->getDebugValueInt(OPT_OUTPUTLIMIT, agent.queryWorkUnit()->getDebugValueInt(OPT_OUTPUTLIMIT_LEGACY, defaultDaliResultLimit)) * 0x100000;
    MemoryBuffer rowdata;
    CThorDemoRowSerializer out(rowdata);
    Owned<IOutputRowSerializer> serializer = input->queryOutputMeta()->createDiskSerializer(agent.queryCodeContext(), activityId);
    rtlSerializeDictionary(out, serializer, builder.getcount(), builder.queryrows());
    if(outputLimit && (rowdata.length()  > outputLimit))
    {
        StringBuffer errMsg("Dictionary too large to output to workunit (limit ");
        errMsg.append(outputLimit/0x100000).append(" megabytes), in result (");
        const char *name = helper.queryName();
        if (name)
            errMsg.append("name=").append(name);
        else
            errMsg.append("sequence=").append(helper.getSequence());
        errMsg.append(")");
        throw MakeStringExceptionDirect(0, errMsg.str());
    }

    WorkunitUpdate w = agent.updateWorkUnit();
    Owned<IWUResult> result = updateWorkUnitResult(w, helper.queryName(), helper.getSequence());
    result->setResultRaw(rowdata.length(), rowdata.toByteArray(), ResultFormatRaw);
    result->setResultStatus(ResultStatusCalculated);
    result->setResultRowCount(usedCount);
    result->setResultTotalRowCount(usedCount); // Is this right??
}

//=====================================================================================================


CHThorRemoteResultActivity::CHThorRemoteResultActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorRemoteResultArg &_arg, ThorActivityKind _kind, EclGraph & _graph)
 : CHThorActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(_arg)
{
}

void CHThorRemoteResultActivity::execute()
{
    OwnedConstRoxieRow result(input->nextRow());
    helper.sendResult(result);
}


//=====================================================================================================

CHThorInlineTableActivity::CHThorInlineTableActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorInlineTableArg &_arg, ThorActivityKind _kind, EclGraph & _graph) :
                 CHThorSimpleActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(_arg)
{
}

void CHThorInlineTableActivity::ready()
{
    CHThorSimpleActivityBase::ready();
    curRow = 0;
    numRows = helper.numRows();
}


const void *CHThorInlineTableActivity::nextRow()
{
    // Filtering empty rows, returns the next valid row
    while (curRow < numRows)
    {
        RtlDynamicRowBuilder rowBuilder(rowAllocator);
        size32_t size = helper.getRow(rowBuilder, curRow++);
        if (size)
        {
            processed++;
            return rowBuilder.finalizeRowClear(size);
        }
    }
    return NULL;
}

//=====================================================================================================

CHThorNullActivity::CHThorNullActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorArg &_arg, ThorActivityKind _kind, EclGraph & _graph) : CHThorSimpleActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph)
{
}

const void *CHThorNullActivity::nextRow()
{
    return NULL;
}

//=====================================================================================================

CHThorActionActivity::CHThorActionActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorActionArg &_arg, ThorActivityKind _kind, EclGraph & _graph) : CHThorSimpleActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(_arg)
{
}

void CHThorActionActivity::execute()
{
    helper.action();
}

const void *CHThorActionActivity::nextRow()
{
    return NULL;
}
//=====================================================================================================

CHThorSideEffectActivity::CHThorSideEffectActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorSideEffectArg &_arg, ThorActivityKind _kind, EclGraph & _graph) : CHThorSimpleActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(_arg)
{
}

const void *CHThorSideEffectActivity::nextRow()
{
    try
    {
        helper.action();
    }
    catch(IException * e)
    {
        throw makeWrappedException(e);
    }

    return NULL;
}

//=====================================================================================================

CHThorDummyActivity::CHThorDummyActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorArg &_arg, ThorActivityKind _kind, EclGraph & _graph) : CHThorSimpleActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph)
{
}

void CHThorDummyActivity::execute()
{
}

const void *CHThorDummyActivity::nextRow()
{
    return input ? input->nextRow() : NULL;
}

//=====================================================================================================

CHThorWhenActionActivity::CHThorWhenActionActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorArg &_arg, ThorActivityKind _kind, EclGraph & _graph, EclGraphElement * _graphElement)
                         : CHThorSimpleActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph), graphElement(_graphElement)
{
}

void CHThorWhenActionActivity::ready()
{
    CHThorSimpleActivityBase::ready();
    graphElement->executeDependentActions(agent, NULL, WhenBeforeId);
    graphElement->executeDependentActions(agent, NULL, WhenParallelId);
}

void CHThorWhenActionActivity::execute()
{
    graphElement->executeDependentActions(agent, NULL, 1);
}

const void * CHThorWhenActionActivity::nextRow()
{
    return input->nextRow();
}

void CHThorWhenActionActivity::stop()
{
    graphElement->executeDependentActions(agent, NULL, WhenSuccessId);
    CHThorSimpleActivityBase::stop();
}

//=====================================================================================================

CHThorMultiInputActivity::CHThorMultiInputActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorArg &_arg, ThorActivityKind _kind, EclGraph & _graph) : CHThorSimpleActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph)
{
}

void CHThorMultiInputActivity::ready()
{
    CHThorSimpleActivityBase::ready();
    ForEachItemIn(idx, inputs)
        inputs.item(idx)->ready();
}

void CHThorMultiInputActivity::stop()
{
    CHThorSimpleActivityBase::stop();
    ForEachItemIn(idx, inputs)
        inputs.item(idx)->stop();
}

void CHThorMultiInputActivity::resetEOF()
{
    CHThorSimpleActivityBase::resetEOF();
    ForEachItemIn(idx, inputs)
        inputs.item(idx)->resetEOF();
}

void CHThorMultiInputActivity::setInput(unsigned index, IHThorInput *_input)
{
    if (index==inputs.length())
    {
        inputs.append(_input);
    }
    else
    {
        while (!inputs.isItem(index))
            inputs.append(NULL);
        inputs.replace(_input, index);
    }
}

void CHThorMultiInputActivity::updateProgress(IStatisticGatherer &progress) const
{
    CHThorSimpleActivityBase::updateProgress(progress);
    ForEachItemIn(idx, inputs)
    {
        IHThorInput *i = inputs.item(idx);
        if (i)
            i->updateProgress(progress);
    }
}   

//=====================================================================================================

CHThorConcatActivity::CHThorConcatActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorFunnelArg &_arg, ThorActivityKind _kind, EclGraph & _graph) : CHThorMultiInputActivity(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(_arg)
{
}

void CHThorConcatActivity::ready()
{
    grouped = helper.queryOutputMeta()->isGrouped();
    inputIdx = 0;
    curInput = inputs.item(inputIdx);
    eogSeen = false;
    anyThisGroup = false;
    CHThorMultiInputActivity::ready();
}

const void *CHThorConcatActivity::nextRow()
{
    if (!curInput)
        return NULL;  // eof
    const void * next = curInput->nextRow();
    if (next)
    {
        anyThisGroup = true;
        eogSeen = false;
        processed++;
        return next;
    }
    else if (!eogSeen)
    {
        eogSeen = true;
        if (grouped)
        {
            if (anyThisGroup)
            {
                anyThisGroup = false;
                return NULL;
            }
            else
                return nextRow();
        }
        else
            return nextRow();
    }
    else if (inputIdx < inputs.length()-1)
    {
        inputIdx++;
        curInput = inputs.item(inputIdx);
        eogSeen = false;
        anyThisGroup = false;
        return nextRow();
    }
    else
    {
        curInput = NULL;
        return NULL;
    }
}


//=====================================================================================================

CHThorNonEmptyActivity::CHThorNonEmptyActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorNonEmptyArg &_arg, ThorActivityKind _kind, EclGraph & _graph) : CHThorMultiInputActivity(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(_arg)
{
}

void CHThorNonEmptyActivity::ready()
{
    grouped = helper.queryOutputMeta()->isGrouped();
    selectedInput = NULL;
    CHThorMultiInputActivity::ready();
}

const void *CHThorNonEmptyActivity::nextRow()
{
    if (!selectedInput)
    {
        ForEachItemIn(i, inputs)
        {
            IHThorInput * cur = inputs.item(i);
            const void * next = cur->nextRow();
            if (next)
            {
                selectedInput = cur;
                processed++;
                return next;
            }
        }
        return NULL;
    }
    const void * next = selectedInput->nextRow();
    if (next)
        processed++;
    return next;
}


//=====================================================================================================

CHThorRegroupActivity::CHThorRegroupActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorRegroupArg &_arg, ThorActivityKind _kind, EclGraph & _graph) : CHThorMultiInputActivity(_agent, _activityId, _subgraphId, _arg, _kind, _graph)
{
}

void CHThorRegroupActivity::ready()
{
    inputIndex = 0;
    eof = false;
    numProcessedLastGroup = processed;
    CHThorMultiInputActivity::ready();
}


const void * CHThorRegroupActivity::nextFromInputs()
{
    unsigned initialInput = inputIndex;
    while (inputs.isItem(inputIndex))
    {
        OwnedConstRoxieRow next(inputs.item(inputIndex)->nextRow());
        if (next)
        {
            if ((inputIndex != initialInput) && (inputIndex != initialInput+1))
            {
                throw MakeStringException(100, "Mismatched groups supplied to regroup %u", activityId);
            }
            return next.getClear();
        }
        inputIndex++;
    }

    if ((initialInput != 0) && (initialInput+1 != inputs.ordinality()))
        throw MakeStringException(100, "Mismatched groups supplied to Regroup Activity(%u)", activityId);

    inputIndex = 0;
    return NULL;
}

const void * CHThorRegroupActivity::nextRow()
{
    if (eof)
        return NULL;

    const void * ret = nextFromInputs();
    if (ret)
    {
        processed++;
        return ret;
    }

    if (numProcessedLastGroup != processed)
    {
        numProcessedLastGroup = processed;
        return NULL;
    }

    eof = true;
    return NULL;
}

//=====================================================================================================

CHThorRollupGroupActivity::CHThorRollupGroupActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorRollupGroupArg &_arg, ThorActivityKind _kind, EclGraph & _graph) : CHThorSimpleActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(_arg)
{
}

void CHThorRollupGroupActivity::ready()
{
    CHThorSimpleActivityBase::ready();
    eof = false;
}


const void * CHThorRollupGroupActivity::nextRow()
{
    if (eof)
        return NULL;

    for (;;)
    {
        OwnedRowArray group;

        for (;;)
        {
            const void * in = input->nextRow();
            if (!in)
                break;
            group.append(in);
        }

        if (group.ordinality() == 0)
        {
            eof = true;
            return NULL;
        }

        try
        {
            RtlDynamicRowBuilder rowBuilder(rowAllocator);
            size32_t outSize = helper.transform(rowBuilder, group.ordinality(), (const void * *)group.getArray());
            if (outSize)
            {
                processed++;
                return rowBuilder.finalizeRowClear(outSize);
            }
        }
        catch(IException * e)
        {
            throw makeWrappedException(e);
        }
    }
}

//=====================================================================================================

CHThorCombineActivity::CHThorCombineActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorCombineArg &_arg, ThorActivityKind _kind, EclGraph & _graph) : CHThorMultiInputActivity(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(_arg)
{
}

void CHThorCombineActivity::ready()
{
    numProcessedLastGroup = processed;
    CHThorMultiInputActivity::ready();
}

void CHThorCombineActivity::nextInputs(OwnedRowArray & out)
{
    ForEachItemIn(i, inputs)
    {
        const void * next = inputs.item(i)->nextRow();
        if (next)
            out.append(next);
    }
}


const void *CHThorCombineActivity::nextRow()
{
    for (;;)
    {
        OwnedRowArray group;
        nextInputs(group);
        if ((group.ordinality() == 0) && (numProcessedLastGroup == processed))
            nextInputs(group);
        if (group.ordinality() == 0)
        {
            numProcessedLastGroup = processed;
            return NULL;
        }
        else if (group.ordinality() != inputs.ordinality())
        {
            throw MakeStringException(101, "Mismatched group input for Combine Activity(%u)", activityId);
        }

        try
        {
            RtlDynamicRowBuilder rowBuilder(rowAllocator);
            size32_t outSize = helper.transform(rowBuilder, group.ordinality(), (const void * *)group.getArray());
            if (outSize)
            {
                processed++;
                return rowBuilder.finalizeRowClear(outSize);
            }
        }
        catch(IException * e)
        {
            throw makeWrappedException(e);
        }
    }
}

//=====================================================================================================

CHThorCombineGroupActivity::CHThorCombineGroupActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorCombineGroupArg &_arg, ThorActivityKind _kind, EclGraph & _graph) : CHThorSimpleActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(_arg)
{
}

void CHThorCombineGroupActivity::ready()
{
    numProcessedLastGroup = processed;
    CHThorSimpleActivityBase::ready();
    input1->ready();
}

void CHThorCombineGroupActivity::stop()
{
    CHThorSimpleActivityBase::stop();
    input1->stop();
}

void CHThorCombineGroupActivity::setInput(unsigned index, IHThorInput *_input)
{
    if (index==1)
        input1 = _input;
    else
        CHThorSimpleActivityBase::setInput(index, _input);
}


const void *CHThorCombineGroupActivity::nextRow()
{
    for (;;)
    {
        OwnedConstRoxieRow left(input->nextRow());
        if (!left && (numProcessedLastGroup == processed))
            left.setown(input->nextRow());

        if (!left)
        {
            if (numProcessedLastGroup == processed)
            {
                OwnedConstRoxieRow nextRight(input1->nextRow());
                if (nextRight)
                    throw MakeStringException(101, "Missing LEFT record for Combine group Activity(%u)", activityId);
            }
            else
                numProcessedLastGroup = processed;
            return NULL;
        }

        OwnedRowArray group;
        for (;;)
        {
            const void * in = input1->nextRow();
            if (!in)
                break;
            group.append(in);
        }

        if (group.ordinality() == 0)
        {
            throw MakeStringException(101, "Missing RIGHT group for Combine Group Activity(%u)", activityId);
        }

        try
        {
            RtlDynamicRowBuilder rowBuilder(rowAllocator);
            size32_t outSize = helper.transform(rowBuilder, left, group.ordinality(), (const void * *)group.getArray());
            if (outSize)
            {
                processed++;
                return rowBuilder.finalizeRowClear(outSize);
            }
        }
        catch(IException * e)
        {
            throw makeWrappedException(e);
        }
    }
}

//=====================================================================================================

CHThorApplyActivity::CHThorApplyActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorApplyArg &_arg, ThorActivityKind _kind, EclGraph & _graph) : CHThorActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(_arg)
{
}

void CHThorApplyActivity::execute()
{
    try
    {
        helper.start();
        for (;;)
        {
            OwnedConstRoxieRow next(input->nextRow());
            if (!next)
            {
                next.setown(input->nextRow());
                if (!next)
                    break;
            }
            helper.apply(next);
        }
        helper.end();
    }
    catch (IException *e)
    {
        throw makeWrappedException(e);
    }
}

//=====================================================================================================

CHThorDistributionActivity::CHThorDistributionActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorDistributionArg &_arg, ThorActivityKind _kind, EclGraph & _graph)
 : CHThorActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(_arg)
{
}


void CHThorDistributionActivity::execute()
{
    MemoryAttr ma;
    IDistributionTable * * accumulator = (IDistributionTable * *)ma.allocate(helper.queryInternalRecordSize()->getMinRecordSize());
    helper.clearAggregate(accumulator); 

    OwnedConstRoxieRow nextrec(input->nextRow());
    for (;;)
    {
        if (!nextrec)
        {
            nextrec.setown(input->nextRow());
            if (!nextrec)
                break;
        }
        helper.process(accumulator, nextrec);
        nextrec.setown(input->nextRow());
    }
    StringBuffer result;
    result.append("<XML>");
    helper.gatherResult(accumulator, result);
    result.append("</XML>");
    helper.sendResult(result.length(), result.str());
    helper.destruct(accumulator);
}

//---------------------------------------------------------------------------

CHThorWorkunitReadActivity::CHThorWorkunitReadActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorWorkunitReadArg &_arg, ThorActivityKind _kind, EclGraph & _graph) : CHThorSimpleActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(_arg)
{
    first = true;
    bufferStream.setown(createMemoryBufferSerialStream(resultBuffer));
    deserializer.setStream(bufferStream);
}

CHThorWorkunitReadActivity::~CHThorWorkunitReadActivity()
{
}

void CHThorWorkunitReadActivity::ready()
{
    CHThorSimpleActivityBase::ready();

    rowDeserializer.setown(rowAllocator->createDiskDeserializer(agent.queryCodeContext()));

    if(first)
    {
        checkForDiskRead();
        first = false;
    }
    if(diskread)
    {
        diskread->ready();
        return;
    }

    grouped = outputMeta.isGrouped();
    unsigned lenData;
    void * tempData;
    OwnedRoxieString fromWuid(helper.getWUID());
    ICsvToRowTransformer * csvTransformer = helper.queryCsvTransformer();
    IXmlToRowTransformer * xmlTransformer = helper.queryXmlTransformer();
    if (fromWuid)
        agent.queryCodeContext()->getExternalResultRaw(lenData, tempData, fromWuid, helper.queryName(), helper.querySequence(), xmlTransformer, csvTransformer);
    else
        agent.queryCodeContext()->getResultRaw(lenData, tempData, helper.queryName(), helper.querySequence(), xmlTransformer, csvTransformer);
    resultBuffer.setBuffer(lenData, tempData, true);
    eogPending = false;
}

void CHThorWorkunitReadActivity::checkForDiskRead()
{
    StringBuffer diskFilename;
    OwnedRoxieString fromWuid(helper.getWUID());
    if (agent.getWorkunitResultFilename(diskFilename, fromWuid, helper.queryName(), helper.querySequence()))
    {
        diskreadHelper.setown(createWorkUnitReadArg(diskFilename.str(), &helper));
        try
        {
            diskreadHelper->onCreate(agent.queryCodeContext(), NULL, NULL);
        }
        catch(IException * e)
        {
            throw makeWrappedException(e);
        }
        diskread.setown(new CHThorDiskReadActivity(agent, activityId, subgraphId, *diskreadHelper, TAKdiskread, graph, nullptr));
    }
}

void CHThorWorkunitReadActivity::stop()
{
    if(diskread)
        diskread->stop();
    resultBuffer.resetBuffer();
    CHThorSimpleActivityBase::stop();
}


const void *CHThorWorkunitReadActivity::nextRow()
{
    if(diskread)
    {
        const void * ret = diskread->nextRow();
        processed = diskread->queryProcessed();
        return ret;
    }
    if (deserializer.eos()) 
        return NULL;                    

    if (eogPending)
    {
        eogPending = false;
        return NULL;
    }
    RtlDynamicRowBuilder rowBuilder(rowAllocator);
    size32_t newSize = rowDeserializer->deserialize(rowBuilder, deserializer);
    
    if (grouped)
        deserializer.read(sizeof(bool), &eogPending);

    processed++;
    return rowBuilder.finalizeRowClear(newSize);                
}

//=====================================================================================================

CHThorParseActivity::CHThorParseActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorParseArg &_arg, ThorActivityKind _kind, EclGraph & _graph) : CHThorSimpleActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(_arg)
{
    //DebugBreak();
    anyThisGroup = false;
    curSearchTextLen = 0;
    curSearchText = NULL;

    algorithm = createThorParser(agent.queryCodeContext(), helper);
    parser = algorithm->createParser(agent.queryCodeContext(), activityId, helper.queryHelper(), &helper);
    rowIter = parser->queryResultIter();
}

CHThorParseActivity::~CHThorParseActivity()
{
    if (curSearchText && helper.searchTextNeedsFree())
        rtlFree(curSearchText);
    parser->Release();
    algorithm->Release();
}

void CHThorParseActivity::ready()
{
    CHThorSimpleActivityBase::ready();
    anyThisGroup = false;
    parser->reset();
}

void CHThorParseActivity::stop()
{
    CHThorSimpleActivityBase::stop();
    if (curSearchText && helper.searchTextNeedsFree())
        rtlFree(curSearchText);
    curSearchText = NULL;
    in.clear();
}

bool CHThorParseActivity::processRecord(const void * in)
{
    if (curSearchText && helper.searchTextNeedsFree())
        rtlFree(curSearchText);

    curSearchTextLen = 0;
    curSearchText = NULL;
    helper.getSearchText(curSearchTextLen, curSearchText, in);

    return parser->performMatch(*this, in, curSearchTextLen, curSearchText);
}


unsigned CHThorParseActivity::onMatch(ARowBuilder & self, const void * curRecord, IMatchedResults * results, IMatchWalker * walker)
{
    try
    {
        return helper.transform(self, curRecord, results, walker);
    }
    catch(IException * e)
    {
        throw makeWrappedException(e);
    }
}


const void * CHThorParseActivity::nextRow()
{
    for (;;)
    {
        if (rowIter->isValid())
        {
            anyThisGroup = true;
            OwnedConstRoxieRow out = rowIter->getRow();
            rowIter->next();
            processed++;
            return out.getClear();
        }

        in.setown(input->nextRow());
        if (!in)
        {
            if (anyThisGroup)
            {
                anyThisGroup = false;
                return NULL;
            }
            in.setown(input->nextRow());
            if (!in)
                return NULL;
        }

        processRecord(in);
        rowIter->first();
    }
}

//=====================================================================================================

CHThorEnthActivity::CHThorEnthActivity(IAgentContext & _agent, unsigned _activityId, unsigned _subgraphId, IHThorEnthArg & _arg, ThorActivityKind _kind, EclGraph & _graph) : CHThorSimpleActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(_arg), outBuilder(NULL)
{
}

void CHThorEnthActivity::ready()
{
    CHThorSimpleActivityBase::ready();
    outBuilder.setAllocator(rowAllocator);
    numerator = helper.getProportionNumerator();
    denominator = helper.getProportionDenominator();
    started = false;
}

void CHThorEnthActivity::stop()
{
    outBuilder.clear();
}

void CHThorEnthActivity::start()
{
    if(denominator == 0) denominator = 1;
    counter = (helper.getSampleNumber()-1) * greatestCommonDivisor(numerator, denominator);
    if (counter >= denominator)
        counter %= denominator;
    started = true;
}

const void * CHThorEnthActivity::nextRow()
{
    if(!started)
        start();
    OwnedConstRoxieRow ret;
    for (;;)
    {
        ret.setown(input->nextRow());
        if(!ret) //end of group
            ret.setown(input->nextRow());
        if(!ret) //eof
            return NULL;
        if (wanted())
        {
            processed++;
            return ret.getClear();
        }
    }
}

//=====================================================================================================

CHThorTopNActivity::CHThorTopNActivity(IAgentContext & _agent, unsigned _activityId, unsigned _subgraphId, IHThorTopNArg & _arg, ThorActivityKind _kind, EclGraph & _graph)
    : CHThorSimpleActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(_arg), compare(*helper.queryCompare())
{
    hasBest = helper.hasBest();
    grouped = outputMeta.isGrouped();
    curIndex = 0;
    sortedCount = 0;
    limit = 0;
    sorted = NULL;
}

CHThorTopNActivity::~CHThorTopNActivity()
{
    roxiemem::ReleaseRoxieRowRange(sorted, curIndex, sortedCount);
    free(sorted);
}

void CHThorTopNActivity::ready()
{
    CHThorSimpleActivityBase::ready();
    limit = helper.getLimit();
    assertex(limit == (__int64)(size_t)limit);
    sorted = (const void * *)checked_calloc((size_t)(limit+1), sizeof(void *), "topn");
    sortedCount = 0;
    curIndex = 0;
    eof = false;
    eoi = false;
}

void CHThorTopNActivity::stop()
{
    CHThorSimpleActivityBase::stop();
    roxiemem::ReleaseRoxieRowRange(sorted, curIndex, sortedCount);
    free(sorted);
    sorted = NULL;
    curIndex = 0;
    sortedCount = 0;
}

const void * CHThorTopNActivity::nextRow()
{
    if(eof)
        return NULL;
    if(curIndex >= sortedCount)
    {
        bool eog = sortedCount != 0;
        getSorted();
        if(sortedCount == 0)
        {
            eof = true;
            return NULL;
        }
        if (eog)
            return NULL;
    }
    processed++;
    return sorted[curIndex++];
}

bool CHThorTopNActivity::abortEarly()
{
    if (hasBest && (sortedCount == limit))
    {
        int compare = helper.compareBest(sorted[sortedCount-1]);
        if (compare == 0)
        {
            if (grouped)
            {
                //MORE: This would be more efficient if we had a away of skipping to the end of the incomming group.
                OwnedConstRoxieRow next;
                do
                {
                    next.setown(input->nextRow());
                } while(next);
            }
            else
                eoi = true;
            return true;
        }

        //This only checks the lowest element - we could check all elements inserted, but it would increase the number of compares
        if (compare < 0)
            throw MakeStringException(0, "TOPN: row found that exceeds the best value");
    }
    return false;
}


void CHThorTopNActivity::getSorted()
{
    curIndex = 0;
    sortedCount = 0;

    if (eoi)
        return;

    OwnedConstRoxieRow next(input->nextRow());
    while(next)
    {
        if(sortedCount < limit)
        {
            binary_vec_insert_stable(next.getClear(), sorted, sortedCount, compare);
            sortedCount++;
            if (abortEarly())
                return;
        }
        else
        {
            // do not bother with insertion sort if we know next will fall off the end
            if(limit && compare.docompare(sorted[sortedCount-1], next) > 0)
            {
                binary_vec_insert_stable(next.getClear(), sorted, sortedCount, compare);
                ReleaseRoxieRow(sorted[sortedCount]);
                if (abortEarly())
                    return;
            }
        }
        next.setown(input->nextRow());
    }
}

//=====================================================================================================

CHThorXmlParseActivity::CHThorXmlParseActivity(IAgentContext & _agent, unsigned _activityId, unsigned _subgraphId, IHThorXmlParseArg & _arg, ThorActivityKind _kind, EclGraph & _graph)
    : CHThorSimpleActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(_arg)
{
    srchStrNeedsFree = helper.searchTextNeedsFree();
    srchStr = NULL;
}

CHThorXmlParseActivity::~CHThorXmlParseActivity()
{
    if(srchStrNeedsFree) rtlFree(srchStr);
}

void CHThorXmlParseActivity::ready()
{
    CHThorSimpleActivityBase::ready();
    numProcessedLastGroup = processed;
}

void CHThorXmlParseActivity::stop()
{
    CHThorSimpleActivityBase::stop();
    if(srchStrNeedsFree) rtlFree(srchStr);
    srchStr = NULL;
    in.clear();
}


const void * CHThorXmlParseActivity::nextRow()
{
    for (;;)
    {
        if(xmlParser)
        {
            for (;;)
            {
                bool gotNext = false;
                try
                {
                    gotNext = xmlParser->next();
                }
                catch(IException * e)
                {
                    throw makeWrappedException(e);
                }
                if(!gotNext)
                {
                    if(srchStrNeedsFree)
                    {
                        rtlFree(srchStr);
                        srchStr = NULL;
                    }
                    xmlParser.clear();
                    break;
                }
                if(lastMatch)
                {
                    try
                    {
                        RtlDynamicRowBuilder rowBuilder(rowAllocator);
                        unsigned sizeGot = helper.transform(rowBuilder, in, lastMatch);
                        lastMatch.clear();
                        if (sizeGot)
                        {
                            processed++;
                            return rowBuilder.finalizeRowClear(sizeGot);
                        }
                    }
                    catch(IException * e)
                    {
                        throw makeWrappedException(e);
                    }
                }
            }
        }
        in.setown(input->nextRow());
        if(!in)
        {
            if(numProcessedLastGroup == processed)
                in.setown(input->nextRow());
            if(!in)
            {
                numProcessedLastGroup = processed;
                return NULL;
            }
        }
        size32_t srchLen;
        helper.getSearchText(srchLen, srchStr, in);
        OwnedRoxieString xmlIteratorPath(helper.getXmlIteratorPath());
        xmlParser.setown(createXMLParse(srchStr, srchLen, xmlIteratorPath, *this, ptr_noRoot, helper.requiresContents()));
    }
}

//=====================================================================================================

class CHThorMergeActivity : public CHThorMultiInputActivity
{
protected:
    IHThorMergeArg &helper;
    CHThorStreamMerger merger;

public:
    CHThorMergeActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorMergeArg &_arg, ThorActivityKind _kind, EclGraph & _graph) : CHThorMultiInputActivity(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(_arg)
    {
        merger.init(helper.queryCompare(), helper.dedup(), NULL);       // can mass null for range because merger.nextGE() never called
    }

    ~CHThorMergeActivity()
    {
        merger.cleanup();
    }

    virtual void ready()
    {
        CHThorMultiInputActivity::ready();
        merger.initInputs(inputs.length(), inputs.getArray());
    }

    virtual void stop() 
    {
        merger.done();
        CHThorMultiInputActivity::stop(); 
    }

    virtual const void * nextRow()
    {
        const void * ret = merger.nextRow();
        if (ret)
            processed++;
        return ret;
    }
};

//=====================================================================================================
//Web Service Call base
CHThorWSCBaseActivity::CHThorWSCBaseActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorWebServiceCallArg &_arg, ThorActivityKind _kind, EclGraph & _graph) : CHThorSimpleActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(_arg)
{
    callHelper = &_arg;
    init();
}

CHThorWSCBaseActivity::CHThorWSCBaseActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorWebServiceCallActionArg &_arg, ThorActivityKind _kind, EclGraph & _graph) : CHThorSimpleActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(_arg)
{
    callHelper = NULL;
    init();
}

void CHThorWSCBaseActivity::stop()
{
    WSChelper.clear();//doesn't return until helper threads terminate
    CHThorSimpleActivityBase::stop();
}

void CHThorWSCBaseActivity::init()
{
    // Build authentication token
    StringBuffer uidpair;
    IUserDescriptor *userDesc = agent.queryCodeContext()->queryUserDescriptor();
    if (userDesc)//NULL if standalone
    {
        userDesc->getUserName(uidpair);
        uidpair.append(":");
        userDesc->getPassword(uidpair);
        JBASE64_Encode(uidpair.str(), uidpair.length(), authToken, false);
    }
    soapTraceLevel = agent.queryWorkUnit()->getDebugValueInt("soapTraceLevel", 1);
}

//---------------------------------------------------------------------------

CHThorWSCRowCallActivity::CHThorWSCRowCallActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorWebServiceCallArg &_arg, ThorActivityKind _kind, EclGraph & _graph) : CHThorWSCBaseActivity(_agent, _activityId, _subgraphId, _arg, _kind, _graph)
{
}

const void *CHThorWSCRowCallActivity::nextRow()
{
    try
    {
        assertex(WSChelper);
        OwnedConstRoxieRow ret = WSChelper->getRow();
        if (!ret)
            return NULL;
        ++processed;
        return ret.getClear();
    }
    catch(IException * e)
    {
        throw makeWrappedException(e);
    }
}

//---------------------------------------------------------------------------

const void *CHThorHttpRowCallActivity::nextRow()
{
    try
    {
        if (WSChelper == NULL)
        {
            WSChelper.setown(createHttpCallHelper(this, rowAllocator, authToken.str(), SCrow, NULL, queryDummyContextLogger(),NULL));
            WSChelper->start();
        }
        return CHThorWSCRowCallActivity::nextRow();
    }
    catch(IException * e)
    {
        throw makeWrappedException(e);
    }
}

//---------------------------------------------------------------------------

const void *CHThorSoapRowCallActivity::nextRow()
{
    try
    {
        if (WSChelper == NULL)
        {
            WSChelper.setown(createSoapCallHelper(this, rowAllocator, authToken.str(), SCrow, NULL, queryDummyContextLogger(),NULL));
            WSChelper->start();
        }
        return CHThorWSCRowCallActivity::nextRow();
    }
    catch(IException * e)
    {
        throw makeWrappedException(e);
    }
}

//---------------------------------------------------------------------------
//---------------------------------------------------------------------------
//---------------------------------------------------------------------------

CHThorSoapRowActionActivity::CHThorSoapRowActionActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorSoapActionArg &_arg, ThorActivityKind _kind, EclGraph & _graph) : CHThorWSCBaseActivity(_agent, _activityId, _subgraphId, _arg, _kind, _graph)
{
}

void CHThorSoapRowActionActivity::execute()
{
    try
    {
        WSChelper.setown(createSoapCallHelper(this, NULL, authToken.str(), SCrow, NULL, queryDummyContextLogger(),NULL));
        WSChelper->start();
        WSChelper->waitUntilDone();
    }
    catch(IException * e)
    {
        throw makeWrappedException(e);
    }
    IException *e = WSChelper->getError();
    if(e)
        throw makeWrappedException(e);
}

//---------------------------------------------------------------------------

CHThorSoapDatasetCallActivity::CHThorSoapDatasetCallActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorSoapCallArg &_arg, ThorActivityKind _kind, EclGraph & _graph) : CHThorWSCBaseActivity(_agent, _activityId, _subgraphId, _arg, _kind, _graph)
{
}


const void * CHThorSoapDatasetCallActivity::nextRow()
{
    try
    {
        if (WSChelper == NULL)
        {
            WSChelper.setown(createSoapCallHelper(this, rowAllocator, authToken.str(), SCdataset, NULL, queryDummyContextLogger(),NULL));
            WSChelper->start();
        }
        OwnedConstRoxieRow ret = WSChelper->getRow();
        if (!ret)
            return NULL;
        ++processed;
        return ret.getClear();
    }
    catch(IException * e)
    {
        throw makeWrappedException(e);
    }
}

const void * CHThorSoapDatasetCallActivity::getNextRow()
{
    CriticalBlock b(crit);

    const void *nextrec = input->nextRow();
    if (!nextrec)
    {
        nextrec = input->nextRow();
    }

    return nextrec;
};

//---------------------------------------------------------------------------

CHThorSoapDatasetActionActivity::CHThorSoapDatasetActionActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorSoapActionArg &_arg, ThorActivityKind _kind, EclGraph & _graph) : CHThorWSCBaseActivity(_agent, _activityId, _subgraphId, _arg, _kind, _graph)
{
}

void CHThorSoapDatasetActionActivity::execute()
{
    try
    {
        WSChelper.setown(createSoapCallHelper(this, NULL, authToken.str(), SCdataset, NULL, queryDummyContextLogger(),NULL));
        WSChelper->start();
        WSChelper->waitUntilDone();
    }
    catch(IException * e)
    {
        throw makeWrappedException(e);
    }
    IException *e = WSChelper->getError();
    if(e)
        throw makeWrappedException(e);
}

const void * CHThorSoapDatasetActionActivity::getNextRow()
{
    CriticalBlock b(crit);

    const void *nextrec = input->nextRow();
    if (!nextrec)
    {
        nextrec = input->nextRow();
    }
    if (nextrec)
    {
        processed++;
    }

    return nextrec;
};

//=====================================================================================================

CHThorResultActivity::CHThorResultActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorArg &_arg, ThorActivityKind _kind, EclGraph & _graph)
 : CHThorActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph)
{
}

void CHThorResultActivity::extractResult(unsigned & retSize, void * & ret)
{
    unsigned len = rowdata.length();
    retSize = len;
    if (len)
    {
        void * temp = rtlMalloc(len);
        memcpy(temp, rowdata.toByteArray(), len);
        ret = temp;
    }
    else
        ret = NULL;
}

//=====================================================================================================

CHThorDatasetResultActivity::CHThorDatasetResultActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorDatasetResultArg &_arg, ThorActivityKind _kind, EclGraph & _graph)
 : CHThorResultActivity(_agent, _activityId, _subgraphId, _arg, _kind, _graph)
{
}

void CHThorDatasetResultActivity::execute()
{
    rowdata.clear();
    IRecordSize * inputMeta = input->queryOutputMeta();
    for (;;)
    {
        OwnedConstRoxieRow nextrec(input->nextRow());
        if (!nextrec)
        {
            nextrec.setown(input->nextRow());
            if (!nextrec)
                break;
        }
        rowdata.append(inputMeta->getRecordSize(nextrec), nextrec);
    }
}


//=====================================================================================================

CHThorRowResultActivity::CHThorRowResultActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorRowResultArg &_arg, ThorActivityKind _kind, EclGraph & _graph)
 : CHThorResultActivity(_agent, _activityId, _subgraphId, _arg, _kind, _graph)
{
}

void CHThorRowResultActivity::execute()
{
    OwnedConstRoxieRow nextrec(input->nextRow());
    assertex(nextrec);
    IRecordSize * inputMeta = input->queryOutputMeta();
    unsigned length = inputMeta->getRecordSize(nextrec);
    rowdata.clear().append(length, nextrec);
}

//=====================================================================================================

CHThorChildIteratorActivity::CHThorChildIteratorActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorChildIteratorArg &_arg, ThorActivityKind _kind, EclGraph & _graph) : CHThorSimpleActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(_arg)
{
}


const void *CHThorChildIteratorActivity::nextRow()
{
    if (eof)
        return NULL;

    bool ok;
    if (!started)
    {
        ok = helper.first();
        started = true;
    }
    else
        ok = helper.next();

    try
    {
        while(ok)
        {
            RtlDynamicRowBuilder rowBuilder(rowAllocator);
            size32_t outSize = helper.transform(rowBuilder);
            if(outSize)
            {
                processed++;
                return rowBuilder.finalizeRowClear(outSize);
            }
            ok = helper.next();
        }
    }
    catch(IException * e)
    {
        throw makeWrappedException(e);
    }

    eof = true;
    return NULL;
}

void CHThorChildIteratorActivity::ready()
{
    CHThorSimpleActivityBase::ready();
    started = false;
    eof = false;
}

//=====================================================================================================

CHThorLinkedRawIteratorActivity::CHThorLinkedRawIteratorActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorLinkedRawIteratorArg &_arg, ThorActivityKind _kind, EclGraph & _graph)
    : CHThorSimpleActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(_arg)
{
}

const void *CHThorLinkedRawIteratorActivity::nextRow()
{
    const void *ret =helper.next();
    if (ret)
    {
        LinkRoxieRow(ret);
        processed++;
    }
    return ret;
}
//=====================================================================================================

//=====================================================================================================
//== New implementations - none are currently used, created or tested =================================
//=====================================================================================================

CHThorChildNormalizeActivity::CHThorChildNormalizeActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorChildNormalizeArg &_arg, ThorActivityKind _kind, EclGraph & _graph) : CHThorSimpleActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(_arg)
{
}


const void *CHThorChildNormalizeActivity::nextRow()
{
    if (eof)
        return NULL;

    bool ok;
    if (!started)
    {
        ok = helper.first();
        started = true;
    }
    else
        ok = helper.next();

    try
    {
        if (ok)
        {
            RtlDynamicRowBuilder rowBuilder(rowAllocator);
            do {
                unsigned thisSize = helper.transform(rowBuilder);
                if (thisSize)
                {
                    processed++;
                    return rowBuilder.finalizeRowClear(thisSize);
                }
                ok = helper.next();
            }
            while (ok);
        }
    }
    catch(IException * e)
    {
        throw makeWrappedException(e);
    }

    eof = true;
    return NULL;
}

void CHThorChildNormalizeActivity::ready()
{
    CHThorSimpleActivityBase::ready();
    started = false;
    eof = false;
}

//=====================================================================================================

CHThorChildAggregateActivity::CHThorChildAggregateActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorChildAggregateArg &_arg, ThorActivityKind _kind, EclGraph & _graph) : CHThorSimpleActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(_arg)
{
}


const void *CHThorChildAggregateActivity::nextRow()
{
    if (eof)
        return NULL;

    eof = true;
    processed++;
    try
    {
        RtlDynamicRowBuilder rowBuilder(rowAllocator);
        helper.clearAggregate(rowBuilder);
        helper.processRows(rowBuilder);
        size32_t finalSize = outputMeta.getRecordSize(rowBuilder.getSelf());
        return rowBuilder.finalizeRowClear(finalSize);
    }
    catch(IException * e)
    {
        throw makeWrappedException(e);
    }
}

void CHThorChildAggregateActivity::ready()
{
    CHThorSimpleActivityBase::ready();
    eof = false;
}

//=====================================================================================================

CHThorChildGroupAggregateActivity::CHThorChildGroupAggregateActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorChildGroupAggregateArg &_arg, ThorActivityKind _kind, EclGraph & _graph)
  : CHThorSimpleActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph),
    helper(_arg), 
    aggregated(_arg, _arg)
{
}

void CHThorChildGroupAggregateActivity::ready()
{
    CHThorSimpleActivityBase::ready();
    eof = false;
    gathered = false;
    aggregated.start(rowAllocator, agent.queryCodeContext(), activityId);
}

void CHThorChildGroupAggregateActivity::stop()
{
    aggregated.reset();
    CHThorSimpleActivityBase::stop();
}


void CHThorChildGroupAggregateActivity::processRow(const void * next)
{
    aggregated.addRow(next);
}
        

const void * CHThorChildGroupAggregateActivity::nextRow()
{
    if (eof)
        return NULL;

    if (!gathered)
    {
        helper.processRows(this);
        gathered = true;
    }

    Owned<AggregateRowBuilder> next = aggregated.nextResult();
    if (next)
    {
        processed++;
        return next->finalizeRowClear();
    }
    eof = true;
    return NULL;
}


//=====================================================================================================

CHThorChildThroughNormalizeActivity::CHThorChildThroughNormalizeActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorChildThroughNormalizeArg &_arg, ThorActivityKind _kind, EclGraph & _graph) : CHThorSimpleActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(_arg), outBuilder(NULL)
{
}

void CHThorChildThroughNormalizeActivity::stop()
{
    outBuilder.clear();
    lastInput.clear();
    CHThorSimpleActivityBase::stop();
}

void CHThorChildThroughNormalizeActivity::ready()
{
    CHThorSimpleActivityBase::ready();
    outBuilder.setAllocator(rowAllocator);
    numProcessedLastGroup = processed;
    ok = false;
}


const void *CHThorChildThroughNormalizeActivity::nextRow()
{
    try
    {
        for (;;)
        {
            if (ok)
                ok = helper.next();

            while (!ok)
            {
                lastInput.setown(input->nextRow());
                if (!lastInput)
                {
                    if (numProcessedLastGroup != processed)
                    {
                        numProcessedLastGroup = processed;
                        return NULL;
                    }
                    lastInput.setown(input->nextRow());
                    if (!lastInput)
                        return NULL;
                }

                ok = helper.first(lastInput);
            }
            
            outBuilder.ensureRow();
            do 
            {
                size32_t thisSize = helper.transform(outBuilder);
                if (thisSize)
                {
                    processed++;
                    return outBuilder.finalizeRowClear(thisSize);
                }
                ok = helper.next();
            } while (ok);
        }
    }
    catch(IException * e)
    {
        throw makeWrappedException(e);
    }
}

//=====================================================================================================

CHThorDiskReadBaseActivity::CHThorDiskReadBaseActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorDiskReadBaseArg &_arg, ThorActivityKind _kind, IPropertyTree *_node, EclGraph & _graph) : CHThorActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(_arg)
{
    helper.setCallback(this);
    expectedDiskMeta = helper.queryDiskRecordSize();
    projectedDiskMeta = helper.queryProjectedDiskRecordSize();
    actualDiskMeta.set(helper.queryDiskRecordSize()->querySerializedDiskMeta());
    isCodeSigned = false;
    if (_node)
    {
        const char *recordTranslationModeHintText = _node->queryProp("hint[@name='layouttranslation']/@value");
        if (recordTranslationModeHintText)
            recordTranslationModeHint = getTranslationMode(recordTranslationModeHintText, true);
        isCodeSigned = isActivityCodeSigned(*_node);
    }
}

CHThorDiskReadBaseActivity::~CHThorDiskReadBaseActivity()
{
    close();
}

void CHThorDiskReadBaseActivity::ready()        
{ 
    CHThorActivityBase::ready(); 

    grouped = false;
    fixedDiskRecordSize = 0;
    eofseen = false;
    opened = false;
    compressed = false;
    rowcompressed = false;
    blockcompressed = false;
    persistent = false;
    localOffset = 0;
    offsetOfPart = 0;
    partNum = (unsigned)-1;

    resolve();

    unsigned expectedCrc = helper.getDiskFormatCrc();
    unsigned projectedCrc = helper.getProjectedFormatCrc();
    IDistributedFile *dFile = nullptr;
    if (ldFile)
        dFile = ldFile->queryDistributedFile();  // Null for local file usage

    Owned<IOutputMetaData> publishedMeta;
    unsigned publishedCrc = 0;
    RecordTranslationMode translationMode = getLayoutTranslationMode();
    StringBuffer traceName;
    if (dFile)
    {
        const char *kind = queryFileKind(dFile);
        if (strisame(kind, "flat") || (RecordTranslationMode::AlwaysDisk == translationMode))
        {
            IPropertyTree &props = dFile->queryAttributes();
            publishedMeta.setown(getDaliLayoutInfo(props));
            if (publishedMeta)
                publishedCrc = props.getPropInt("@formatCrc");
        }
        dFile->getLogicalName(traceName);
    }
    else
        traceName.set("hthor-diskread");
    translators.setown(::getTranslators(traceName.str(), expectedCrc, expectedDiskMeta, publishedCrc, publishedMeta, projectedCrc, projectedDiskMeta, translationMode));
    if (translators)
    {
        if (publishedCrc && expectedCrc && publishedCrc != expectedCrc)
        {
            VStringBuffer msg("Record layout translation required for %s", traceName.str());
            agent.addWuExceptionEx(msg.str(), WRN_UseLayoutTranslation, SeverityInformation, MSGAUD_user, "hthor");
        }
        translator = &translators->queryTranslator();
        keyedTranslator = translators->queryKeyedTranslator();
        actualDiskMeta.set(&translators->queryActualFormat());
    }
    else
    {
        translator = nullptr;
        keyedTranslator = nullptr;
        actualDiskMeta.set(helper.queryDiskRecordSize()->querySerializedDiskMeta());
    }
}

void CHThorDiskReadBaseActivity::stop()
{
    close();
    CHThorActivityBase::stop();
}

#define TE_FileTypeMismatch 10138 // NB: duplicated from thorlcr/shared/thexception.hpp, but be moved to common header
void CHThorDiskReadBaseActivity::checkFileType(IDistributedFile *file)
{
    if (rt_csv == readType)
        return; // CSV read is permitted to read any type
    if (!agent.queryWorkUnit()->getDebugValueInt(OPT_VALIDATE_FILE_TYPE, true))
        return;
    bool warningOnly = false;
    const char *expectedType = nullptr;
    switch (readType)
    {
        case rt_binary:
            if (fixedDiskRecordSize) // we allow fixed width reads of other formats
                return;
            expectedType = "flat";
            break;
        case rt_xml:
            expectedType = "xml";
            warningOnly = true;
            break;
        case rt_json:
            expectedType = "json";
            warningOnly = true;
            break;
        default:
            throwUnexpected();
    }
    const char *kind = queryFileKind(file);
    if (isEmptyString(kind)) // file has no published kind, can't validate
        return;
    if (!strieq(kind, expectedType))
    {        
        Owned<IException> e = makeStringExceptionV(TE_FileTypeMismatch, "File format mismatch reading file: '%s'. Expected type '%s', but file is type '%s'", file->queryLogicalName(), expectedType, kind);
        if (!warningOnly)
            throw e.getClear();
        StringBuffer tmp;
        agent.addWuException(e->errorMessage(tmp), e->errorCode(), SeverityWarning, "eclagent");
    }
}

void CHThorDiskReadBaseActivity::resolve()
{
    OwnedRoxieString fileName(helper.getFileName());
    mangleHelperFileName(mangledHelperFileName, fileName, agent.queryWuid(), helper.getFlags());
    if (helper.getFlags() & (TDXtemporary | TDXjobtemp))
    {
        StringBuffer mangledFilename;
        mangleLocalTempFilename(mangledFilename, mangledHelperFileName.str(), nullptr);
        tempFileName.set(agent.queryTemporaryFile(mangledFilename.str()));
        logicalFileName.set(tempFileName);
        gatherInfo(NULL);
    }
    else
    {
        ldFile.setown(resolveLFNFlat(agent, mangledHelperFileName.str(), "Read", 0 != (helper.getFlags() & TDRoptional), isCodeSigned));
        if ( mangledHelperFileName.charAt(0) == '~')
            logicalFileName.set(mangledHelperFileName.str()+1);
        else
            logicalFileName.set(mangledHelperFileName.str());

        if (ldFile)
        {
            Owned<IFileDescriptor> fdesc;
            fdesc.setown(ldFile->getFileDescriptor());
            gatherInfo(fdesc);
            if (ldFile->isExternal())
                compressed = checkWriteIsCompressed(helper.getFlags(), fixedDiskRecordSize, false);//grouped=FALSE because fixedDiskRecordSize already includes grouped
            IDistributedFile *dFile = ldFile->queryDistributedFile();
            if (dFile)  //only makes sense for distributed (non local) files
            {
                checkFileType(dFile); // throws an exception if file types mismatch

                persistent = dFile->queryAttributes().getPropBool("@persistent");
                dfsParts.setown(dFile->getIterator());
                IDistributedSuperFile *super = dFile->querySuperFile();
                if (super)
                {
                    assertex(fdesc);
                    superfile.set(fdesc->querySuperFileDescriptor());
                    if (helper.getFlags() & TDRfilenamecallback)
                    {
                        unsigned numsubs = super->numSubFiles(true);
                        unsigned s=0;
                        for (; s<numsubs; s++)
                        {
                            IDistributedFile &subfile = super->querySubFile(s, true);
                            subfileLogicalFilenames.append(subfile.queryLogicalName());
                        }
                        if (!superfile && numsubs>0)
                            logicalFileName.set(subfileLogicalFilenames.item(0));
                    }
                }
                if((helper.getFlags() & (TDXtemporary | TDXjobtemp)) == 0)
                    agent.logFileAccess(dFile, "HThor", "READ", graph);
                if(getLayoutTranslationMode()==RecordTranslationMode::None)
                    verifyRecordFormatCrc();
            }
        }
        if (!ldFile)
        {
            StringBuffer buff;
            buff.appendf("Input file '%s' was missing but declared optional", mangledHelperFileName.str());
            agent.addWuExceptionEx(buff.str(), WRN_SkipMissingOptFile, SeverityInformation, MSGAUD_user, "hthor");
        }
    }
}

void CHThorDiskReadBaseActivity::gatherInfo(IFileDescriptor * fileDesc)
{
    if (fileDesc)
    {
        if (!agent.queryResolveFilesLocally())
        {
            grouped = fileDesc->isGrouped();
            if (grouped != ((helper.getFlags() & TDXgrouped) != 0))
            {
                StringBuffer msg;
                msg.append("DFS and code generated group info. differs: DFS(").append(grouped ? "grouped" : "ungrouped").append("), CodeGen(").append(grouped ? "ungrouped" : "grouped").append("), using DFS info");
                agent.addWuExceptionEx(msg.str(), WRN_MismatchGroupInfo, SeverityError, MSGAUD_user, "hthor");
            }
        }
        else
            grouped = ((helper.getFlags() & TDXgrouped) != 0);
    }
    else
    {
        grouped = ((helper.getFlags() & TDXgrouped) != 0);
    }

    calcFixedDiskRecordSize();
    if (fileDesc)
    {
        compressed = fileDesc->isCompressed(&blockcompressed); //try new decompression, fall back to old unless marked as block
        if (fixedDiskRecordSize)
        {
            if (!compressed && (((helper.getFlags() & TDXcompress) != 0) && (fixedDiskRecordSize >= MIN_ROWCOMPRESS_RECSIZE)))
            {
                StringBuffer msg;
                msg.append("Ignoring compression attribute on file ").append(mangledHelperFileName.str()).append(", which is not published as compressed");
                agent.addWuExceptionEx(msg.str(), WRN_MismatchCompressInfo, SeverityWarning, MSGAUD_user, "hthor");
                compressed = true;
            }
        }
    }
    else
    {
        compressed = checkReadIsCompressed(helper.getFlags(), fixedDiskRecordSize, false); //grouped=FALSE because fixedDiskRecordSize already includes grouped
    }
    void *k;
    size32_t kl;
    helper.getEncryptKey(kl,k);
    encryptionkey.setOwn(kl,k);

    if (encryptionkey.length()!=0) 
    {
        blockcompressed = true;
        compressed = true;
    }
}

void CHThorDiskReadBaseActivity::close()
{
    closepart();
    tempFileName.clear();
    dfsParts.clear();
    if(ldFile)
    {
        IDistributedFile * dFile = ldFile->queryDistributedFile();
        if(dFile)
            dFile->setAccessed();
        ldFile.clear();
    }
}

unsigned __int64 CHThorDiskReadBaseActivity::getFilePosition(const void * row)
{
    return localOffset + offsetOfPart;
}

unsigned __int64 CHThorDiskReadBaseActivity::getLocalFilePosition(const void * row)
{
    return makeLocalFposOffset(partNum-1, localOffset);
}

void CHThorDiskReadBaseActivity::closepart()
{
    if (opened && inputfileio && ldFile && partNum > 0)
    {
        unsigned previousPartNum = partNum-1;
        if (previousPartNum < ldFile->numParts())
        {
            stat_type curDiskReads = inputfileio->getStatistic(StNumDiskReads);
            IDistributedFile * dFile = ldFile->queryDistributedFile();
            if (dFile)
            {
                if (superfile)
                {
                    unsigned subfile, lnum;
                    if (superfile->mapSubPart(previousPartNum, subfile, lnum))
                    {
                        IDistributedSuperFile *super = dFile->querySuperFile();
                        dFile = &(super->querySubFile(subfile, true));
                    }
                }
                dFile->addAttrValue("@numDiskReads", curDiskReads);
                StringBuffer clusterName;
                dFile->getClusterName(0, clusterName);
                diskAccessCost = money2cost_type(calcFileAccessCost(clusterName, 0, curDiskReads));
            }
            numDiskReads += curDiskReads;
        }
    }
    inputstream.clear();
    inputfileio.clear();
    inputfile.clear();
}

bool CHThorDiskReadBaseActivity::openNext()
{
    offsetOfPart += localOffset;
    localOffset = 0;
    saveOpenExc.clear();
    actualFilter.clear();
    if (translators)
    {
        /* If previous part was remotely accessed, the format used (actualDiskMeta), became the projected meta.
         * Reset for local/direct access.
         */
        translator = &translators->queryTranslator();
        keyedTranslator = translators->queryKeyedTranslator();
        actualDiskMeta.set(&translators->queryActualFormat());
    }

    if (dfsParts||ldFile)
    {
        // open next part of a multipart, if there is one
        while ((dfsParts&&dfsParts->isValid())||
              (!dfsParts&&(partNum<ldFile->numParts())))
        {
            IDistributedFilePart * curPart = dfsParts?&dfsParts->query():NULL;

            unsigned numCopies = curPart?curPart->numCopies():ldFile->numPartCopies(partNum);
            //MORE: Order of copies should be optimized at this point....
            StringBuffer file, filelist;
            closepart();
            if (dfsParts && superfile && curPart && !subfileLogicalFilenames.empty())
            {
                unsigned subfile;
                unsigned lnum;
                if (superfile->mapSubPart(partNum, subfile, lnum))
                {
                    logicalFileName.set(subfileLogicalFilenames.item(subfile));
                    // MORE - need to set dFile = superfile->getSubFilePart(subfile) to support different formats on different file parts
                }
            }

            if (keyedTranslator && keyedTranslator->needsTranslate())
                keyedTranslator->translate(actualFilter, fieldFilters);
            else
                actualFilter.appendFilters(fieldFilters);

            bool tryRemoteStream = actualDiskMeta->queryTypeInfo()->canInterpret() && actualDiskMeta->queryTypeInfo()->canSerialize() &&
                                   projectedDiskMeta->queryTypeInfo()->canInterpret() && projectedDiskMeta->queryTypeInfo()->canSerialize();

            /* If part can potentially be remotely streamed, 1st check if any part is local,
             * then try to remote stream, and otherwise failover to legacy remote access
             */
            unsigned startCopy = 0;
            if (tryRemoteStream && (rt_binary == readType))
            {
                std::vector<unsigned> remoteCandidates;
                // scan for local part 1st
                for (unsigned copy=0; copy<numCopies; copy++)
                {
                    RemoteFilename rfn;
                    if (curPart)
                        curPart->getFilename(rfn,copy);
                    else
                        ldFile->getPartFilename(rfn, partNum, copy);

                    if (!isRemoteReadCandidate(agent, rfn))
                    {
                        StringBuffer path;
                        rfn.getPath(path);
                        Owned<IFile> iFile = createIFile(path);
                        try
                        {
                            if (iFile->exists())
                            {
                                startCopy = copy;
                                remoteCandidates.clear();
                                break;
                            }
                        }
                        catch (IException *e)
                        {
                            EXCLOG(e, "CHThorDiskReadBaseActivity::openNext()");
                            e->Release();
                        }
                    }
                    else
                        remoteCandidates.push_back(copy);
                }

                for (unsigned &copy: remoteCandidates)
                {
                    RemoteFilename rfilename;
                    if (curPart)
                        curPart->getFilename(rfilename,copy);
                    else
                        ldFile->getPartFilename(rfilename,partNum,copy);
                    rfilename.getPath(file.clear());
                    filelist.append('\n').append(file);
                    try
                    {
                        // NB: only binary handles can be remotely processed by dafilesrv at the moment

                        // Open a stream from remote file, having passed actual, expected, projected, and filters to it
                        SocketEndpoint ep(rfilename.queryEndpoint());
                        setDafsEndpointPort(ep);

                        StringBuffer localPath;
                        rfilename.getLocalPath(localPath);
                        Owned<IRemoteFileIO> remoteFileIO = createRemoteFilteredFile(ep, localPath, actualDiskMeta, projectedDiskMeta, actualFilter, compressed, grouped, remoteLimit);
                        if (remoteFileIO)
                        {
                            StringBuffer tmp;
                            remoteFileIO->addVirtualFieldMapping("logicalFilename", logicalFileName.str());
                            remoteFileIO->addVirtualFieldMapping("baseFpos", tmp.clear().append(offsetOfPart).str());
                            remoteFileIO->addVirtualFieldMapping("partNum", tmp.clear().append(curPart->getPartIndex()).str());

                            try
                            {
                                remoteFileIO->ensureAvailable(); // force open now, because want to failover to other copies or legacy if fails
                            }
                            catch (IException *e)
                            {
#ifdef _DEBUG
                                EXCLOG(e, nullptr);
#endif
                                VStringBuffer msg("Remote streaming failure, failing over to direct read for: '%s'. ", file.str());
                                e->errorMessage(msg);
                                agent.addWuExceptionEx(msg.str(), WRN_RemoteReadFailure, SeverityWarning, MSGAUD_user, "hthor");
                                e->Release();
                                continue; // try next copy and ultimately failover to local when no more copies
                            }

                            Owned<IFile> iFile = createIFile(rfilename);

                            // remote side does projection/translation/filtering
                            actualDiskMeta.set(projectedDiskMeta);
                            translator = nullptr;
                            keyedTranslator = nullptr;

                            actualFilter.clear();
                            inputfileio.setown(remoteFileIO.getClear());
                            if (inputfileio)
                            {
                                inputfile.setown(iFile.getClear());
                                break;
                            }
                        }
                    }
                    catch (IException *E)
                    {
                        if (saveOpenExc.get())
                            E->Release();
                        else
                            saveOpenExc.setown(E);
                    }
                    closepart();
                }
            }
            if (!inputfile)
            {
                unsigned copy = startCopy;
                while (true)
                {
                    RemoteFilename rfilename;
                    if (curPart)
                        curPart->getFilename(rfilename,copy);
                    else
                        ldFile->getPartFilename(rfilename,partNum,copy);
                    rfilename.getPath(file.clear());
                    filelist.append('\n').append(file);
                    try
                    {
                        inputfile.setown(createIFile(rfilename));

                        if (compressed)
                        {
                            Owned<IExpander> eexp;
                            if (encryptionkey.length()!=0)
                                eexp.setown(createAESExpander256((size32_t)encryptionkey.length(),encryptionkey.bufferBase()));
                            inputfileio.setown(createCompressedFileReader(inputfile,eexp));
                            if(!inputfileio && !blockcompressed) //fall back to old decompression, unless dfs marked as new
                            {
                                inputfileio.setown(inputfile->open(IFOread));
                                if(inputfileio)
                                    rowcompressed = true;
                            }
                        }
                        else
                            inputfileio.setown(inputfile->open(IFOread));
                        if (inputfileio)
                            break;
                    }
                    catch (IException *E)
                    {
                        if (saveOpenExc.get())
                            E->Release();
                        else
                            saveOpenExc.setown(E);
                    }
                    if (++copy == numCopies) // wrap
                        copy = 0;
                    if (copy == startCopy) // reached starting copy, so scanned all and failed to open any.
                        break;
                }
            }

            calcFixedDiskRecordSize();
            if (dfsParts)
                dfsParts->next();
            partNum++;
            if (checkOpenedFile(file.str(), filelist.str()))
            {
                opened = true;
                return true;
            }
        }
        return false;
    }
    else if (!tempFileName.isEmpty())
    {
        StringBuffer file(tempFileName.get());
        tempFileName.clear();
        closepart();
        try
        {
            inputfile.setown(createIFile(file.str()));
            if(compressed)
            {
                Owned<IExpander> eexp;
                if (encryptionkey.length()) 
                    eexp.setown(createAESExpander256((size32_t) encryptionkey.length(),encryptionkey.bufferBase()));
                inputfileio.setown(createCompressedFileReader(inputfile,eexp));
                if(!inputfileio && !blockcompressed) //fall back to old decompression, unless dfs marked as new
                {
                    inputfileio.setown(inputfile->open(IFOread));
                    if(inputfileio)
                        rowcompressed = true;
                }
            }
            else
                inputfileio.setown(inputfile->open(IFOread));
        }
        catch (IException *E)
        {
            closepart();
            StringBuffer msg;
            IWARNLOG("%s", E->errorMessage(msg).str());
            if (saveOpenExc.get())
                E->Release();
            else
                saveOpenExc.setown(E);
        }

        partNum++;
        if (checkOpenedFile(file.str(), NULL))
        {
            actualFilter.appendFilters(fieldFilters);
            opened = true;
            return true;
        }
    }
    return false;
}

bool CHThorDiskReadBaseActivity::checkOpenedFile(char const * filename, char const * filenamelist)
{
    unsigned __int64 filesize = 0;
    if (!inputfileio) 
    {
        if (!(helper.getFlags() & TDRoptional))
        {
            StringBuffer s;
            if(filenamelist) {
                if (saveOpenExc.get())
                {
                    if (strstr(mangledHelperFileName.str(),"::>")!=NULL) // if a 'special' filename just use saved exception 
                        saveOpenExc->errorMessage(s);
                    else 
                    {
                        s.append("Could not open logical file ").append(mangledHelperFileName.str()).append(" in any of these locations:").append(filenamelist).append(" (");
                        saveOpenExc->errorMessage(s).append(")");
                    }
                }
                else
                    s.append("Could not open logical file ").append(mangledHelperFileName.str()).append(" in any of these locations:").append(filenamelist).append(" (").append((unsigned)GetLastError()).append(")");
            }
            else
                s.append("Could not open local physical file ").append(filename).append(" (").append((unsigned)GetLastError()).append(")");
            agent.fail(1, s.str());
        }
    }
    else
        filesize = inputfileio->size();
    saveOpenExc.clear();
    if (filesize)
    {
        if (!compressed && fixedDiskRecordSize && ((offset_t)-1 != filesize) && (filesize % fixedDiskRecordSize) != 0)
        {
            StringBuffer s;
            s.append("File ").append(filename).append(" size is ").append(filesize).append(" which is not a multiple of ").append(fixedDiskRecordSize);
            agent.fail(1, s.str());
        }

        unsigned readBufferSize = queryReadBufferSize();
        inputstream.setown(createFileSerialStream(inputfileio, 0, filesize, readBufferSize));

        StringBuffer report("Reading file ");
        report.append(inputfile->queryFilename());
        agent.reportProgress(report.str());
    }

    return (filesize != 0);
}

void CHThorDiskReadBaseActivity::open()
{
    assertex(!opened);
    partNum = 0;
    if (dfsParts)
        eofseen = !dfsParts->first() || !openNext();
    else if (ldFile||tempFileName.length())
        eofseen = !openNext();
    else
        eofseen = true;
    opened = true;
}

void CHThorDiskReadBaseActivity::updateProgress(IStatisticGatherer &progress) const
{
    CHThorActivityBase::updateProgress(progress);
    StatsActivityScope scope(progress, activityId);
    progress.addStatistic(StNumDiskReads, numDiskReads);
    progress.addStatistic(StCostFileAccess, diskAccessCost);
}

//=====================================================================================================

CHThorBinaryDiskReadBase::CHThorBinaryDiskReadBase(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorDiskReadBaseArg &_arg, IHThorCompoundBaseArg & _segHelper, ThorActivityKind _kind, IPropertyTree *_node, EclGraph & _graph)
: CHThorDiskReadBaseActivity(_agent, _activityId, _subgraphId, _arg, _kind, _node, _graph),
  segHelper(_segHelper), prefetchBuffer(NULL)
{
    readType = rt_binary;
}

void CHThorBinaryDiskReadBase::calcFixedDiskRecordSize()
{
    fixedDiskRecordSize = actualDiskMeta->getFixedSize();
    if (fixedDiskRecordSize && grouped)
        fixedDiskRecordSize += 1;
}

void CHThorBinaryDiskReadBase::append(FFoption option, const IFieldFilter * filter)
{
    if (filter->isWild())
        filter->Release();
    else
        fieldFilters.append(*filter);
}

void CHThorBinaryDiskReadBase::ready()      
{ 
    CHThorDiskReadBaseActivity::ready(); 
    fieldFilters.kill();
    segHelper.createSegmentMonitors(this);
}

bool CHThorBinaryDiskReadBase::openNext()
{
    if (CHThorDiskReadBaseActivity::openNext())
    {
        if(rowcompressed && fixedDiskRecordSize)
        {
            throwUnexpected();
            //MORE: What happens here
            PROGLOG("Disk read falling back to legacy decompression routine");
            //in.setown(createRowCompReadSeq(*inputfileiostream, 0, fixedDiskRecordSize));
        }
        //Only one of these will actually be used.
        prefetcher.setown(actualDiskMeta->createDiskPrefetcher());
        deserializer.setown(actualDiskMeta->createDiskDeserializer(agent.queryCodeContext(), activityId));
        prefetchBuffer.setStream(inputstream);
        deserializeSource.setStream(inputstream);
        return true;
    }
    return false;
}

void CHThorBinaryDiskReadBase::closepart()
{
    prefetchBuffer.clearStream();
    deserializeSource.clearStream();
    CHThorDiskReadBaseActivity::closepart();
}

unsigned CHThorBinaryDiskReadBase::queryReadBufferSize()
{
    return hthorReadBufferSize;
}

void CHThorBinaryDiskReadBase::open()
{
    if (!segHelper.canMatchAny())
    {
        eofseen = true;
        opened = true;
    }
    else
        CHThorDiskReadBaseActivity::open();
}


//=====================================================================================================

CHThorDiskReadActivity::CHThorDiskReadActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorDiskReadArg &_arg, ThorActivityKind _kind, EclGraph & _graph, IPropertyTree *_node) : CHThorBinaryDiskReadBase(_agent, _activityId, _subgraphId, _arg, _arg, _kind, _node, _graph), helper(_arg), outBuilder(NULL)
{
    needTransform = false;
    eogPending = 0;
    lastGroupProcessed = 0;
}

void CHThorDiskReadActivity::ready()        
{ 
    PARENT::ready(); 
    outBuilder.setAllocator(rowAllocator);
    eogPending = false;
    lastGroupProcessed = processed;
    needTransform = helper.needTransform() || fieldFilters.length();
    limit = helper.getRowLimit();
    if (helper.getFlags() & TDRlimitskips)
        limit = (unsigned __int64) -1;
    stopAfter = helper.getChooseNLimit();
    if (!helper.transformMayFilter() && !helper.hasMatchFilter())
        remoteLimit = stopAfter;
}


void CHThorDiskReadActivity::stop()
{ 
    outBuilder.clear();
    PARENT::stop(); 
}


const void *CHThorDiskReadActivity::nextRow()
{
    if (!opened) open();
    if (eogPending && (lastGroupProcessed != processed))
    {
        eogPending = false;
        lastGroupProcessed = processed;
        return NULL;
    }

    try
    {
        if (needTransform || grouped || translator || keyedTranslator)
        {
            while (!eofseen && ((stopAfter == 0) || ((processed - initialProcessed) < stopAfter)))
            {
                queryUpdateProgress();
                while (!prefetchBuffer.eos())
                {
                    queryUpdateProgress();

                    prefetcher->readAhead(prefetchBuffer);
                    const byte * next = prefetchBuffer.queryRow();
                    size32_t sizeRead = prefetchBuffer.queryRowSize();
                    size32_t thisSize = 0;
                    if (likely(segMonitorsMatch(next))) // NOTE - keyed fields are checked pre-translation
                    {
                        MemoryBuffer translated;
                        if (translator)
                        {
                            MemoryBufferBuilder aBuilder(translated, 0);
                            translator->translate(aBuilder, *this, next);
                            next = aBuilder.getSelf();
                        }
                        if (likely(helper.canMatch(next)))
                            thisSize = helper.transform(outBuilder.ensureRow(), next);
                    }
                    bool eog = false;
                    if (grouped)
                        prefetchBuffer.read(sizeof(eog), &eog);

                    prefetchBuffer.finishedRow();

                    localOffset += sizeRead;
                    if (thisSize)
                    {
                        if (grouped)
                            eogPending = eog;
                        if ((processed - initialProcessed) >= limit)
                        {
                            outBuilder.clear();
                            if ( agent.queryCodeContext()->queryDebugContext())
                                agent.queryCodeContext()->queryDebugContext()->checkBreakpoint(DebugStateLimit, NULL, static_cast<IActivityBase *>(this));
                            helper.onLimitExceeded();
                            return NULL;
                        }
                        processed++;
                        return outBuilder.finalizeRowClear(thisSize);
                    }
                    if (eog && (lastGroupProcessed != processed))
                    {
                        lastGroupProcessed = processed;
                        return NULL;
                    }
                }
                eofseen = !openNext();
            }
        }
        else
        {
            while(!eofseen && ((stopAfter == 0) || (processed - initialProcessed) < stopAfter)) 
            {
                queryUpdateProgress();

                while (!inputstream->eos())
                {
                    size32_t sizeRead = deserializer->deserialize(outBuilder.ensureRow(), deserializeSource);
                    //In this case size read from disk == size created in memory
                    localOffset += sizeRead;
                    OwnedConstRoxieRow ret = outBuilder.finalizeRowClear(sizeRead);
                    if ((processed - initialProcessed)>=limit)
                    {
                        if ( agent.queryCodeContext()->queryDebugContext())
                            agent.queryCodeContext()->queryDebugContext()->checkBreakpoint(DebugStateLimit, NULL, static_cast<IActivityBase *>(this));
                        helper.onLimitExceeded();
                        return NULL;
                    }
                    if (likely(helper.canMatch(ret)))
                    {
                        processed++;
                        return ret.getClear();
                    }
                }
                eofseen = !openNext();
            }
        }
        close();
    }
    catch(IException * e)
    {
        throw makeWrappedException(e);
    }
    return NULL;
}

//=====================================================================================================

CHThorDiskNormalizeActivity::CHThorDiskNormalizeActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorDiskNormalizeArg &_arg, ThorActivityKind _kind, EclGraph & _graph, IPropertyTree *_node) : CHThorBinaryDiskReadBase(_agent, _activityId, _subgraphId, _arg, _arg, _kind, _node, _graph), helper(_arg), outBuilder(NULL)
{
}

void CHThorDiskNormalizeActivity::stop()        
{ 
    outBuilder.clear();
    PARENT::stop(); 
}

void CHThorDiskNormalizeActivity::ready()       
{ 
    PARENT::ready(); 
    outBuilder.setAllocator(rowAllocator);
    limit = helper.getRowLimit();
    if (helper.getFlags() & TDRlimitskips)
        limit = (unsigned __int64) -1;
    stopAfter = helper.getChooseNLimit();
    lastSizeRead = 0;
    expanding = false;
}

void CHThorDiskNormalizeActivity::gatherInfo(IFileDescriptor * fd)
{
    PARENT::gatherInfo(fd);
    assertex(!grouped);
}

const void *CHThorDiskNormalizeActivity::nextRow()
{
    if (!opened) open();
    for (;;)
    {
        if (eofseen || (stopAfter && (processed - initialProcessed) >= stopAfter)) 
            break;

        for (;;)
        {
            if (expanding)
            {
                for (;;)
                {
                    expanding = helper.next();
                    if (!expanding)
                        break;

                    const void * ret = createNextRow();
                    if (ret)
                        return ret;
                }
            }

            localOffset += lastSizeRead;
            prefetchBuffer.finishedRow();

            if (prefetchBuffer.eos())
            {
                lastSizeRead = 0;
                break;
            }

            prefetcher->readAhead(prefetchBuffer);
            const byte * next = prefetchBuffer.queryRow();
            lastSizeRead = prefetchBuffer.queryRowSize();

            queryUpdateProgress();
            if (segMonitorsMatch(next))
            {
                try
                {
                    if (unlikely(translator))
                    {
                        MemoryBufferBuilder aBuilder(translatedRow.clear(), 0);
                        translator->translate(aBuilder, *this, next);
                        next = aBuilder.getSelf();
                    }
                    expanding = helper.first(next);
                }
                catch(IException * e)
                {
                    throw makeWrappedException(e);
                }
                if (expanding)
                {
                    const void * ret = createNextRow();
                    if (ret)
                        return ret;
                }
            }
        }
        eofseen = !openNext();
    }
    close();
    return NULL;
}


const void * CHThorDiskNormalizeActivity::createNextRow()
{
    try
    {
        size32_t thisSize = helper.transform(outBuilder.ensureRow());
        if (thisSize == 0)
            return NULL;

        if ((processed - initialProcessed) >=limit)
        {
            outBuilder.clear();
            if ( agent.queryCodeContext()->queryDebugContext())
                agent.queryCodeContext()->queryDebugContext()->checkBreakpoint(DebugStateLimit, NULL, static_cast<IActivityBase *>(this));
            helper.onLimitExceeded();
            return NULL;
        }
        processed++;
        return outBuilder.finalizeRowClear(thisSize);
    }
    catch(IException * e)
    {
        throw makeWrappedException(e);
    }
}

//=====================================================================================================

CHThorDiskAggregateActivity::CHThorDiskAggregateActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorDiskAggregateArg &_arg, ThorActivityKind _kind, EclGraph & _graph, IPropertyTree *_node) : CHThorBinaryDiskReadBase(_agent, _activityId, _subgraphId, _arg, _arg, _kind, _node, _graph), helper(_arg), outBuilder(NULL)
{
}

void CHThorDiskAggregateActivity::stop()        
{ 
    outBuilder.clear();
    PARENT::stop(); 
}

void CHThorDiskAggregateActivity::ready()       
{ 
    PARENT::ready(); 
    outBuilder.setAllocator(rowAllocator);
    finished = false;
}

void CHThorDiskAggregateActivity::gatherInfo(IFileDescriptor * fd)
{
    PARENT::gatherInfo(fd);
    assertex(!grouped);
}


const void *CHThorDiskAggregateActivity::nextRow()
{
    if (finished) return NULL;
    try
    {
        if (!opened) open();
        outBuilder.ensureRow();
        helper.clearAggregate(outBuilder);
        while (!eofseen)
        {
            while (!prefetchBuffer.eos())
            {
                queryUpdateProgress();

                prefetcher->readAhead(prefetchBuffer);
                const byte * next = prefetchBuffer.queryRow();
                size32_t sizeRead = prefetchBuffer.queryRowSize();
                if (segMonitorsMatch(next))
                {
                    if (unlikely(translator))
                    {
                        MemoryBufferBuilder aBuilder(translatedRow.clear(), 0);
                        translator->translate(aBuilder, *this, next);
                        helper.processRow(outBuilder, aBuilder.getSelf());
                    }
                    else
                        helper.processRow(outBuilder, next);
                }
                prefetchBuffer.finishedRow();
                localOffset += sizeRead;
            }
            eofseen = !openNext();
        }
        close();

        processed++;
        finished = true;
        unsigned retSize = outputMeta.getRecordSize(outBuilder.getSelf());
        return outBuilder.finalizeRowClear(retSize);
    }
    catch(IException * e)
    {
        throw makeWrappedException(e);
    }
}

//=====================================================================================================

CHThorDiskCountActivity::CHThorDiskCountActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorDiskCountArg &_arg, ThorActivityKind _kind, EclGraph & _graph, IPropertyTree *_node) : CHThorBinaryDiskReadBase(_agent, _activityId, _subgraphId, _arg, _arg, _kind, _node, _graph), helper(_arg)
{
    finished = true;
}

CHThorDiskCountActivity::~CHThorDiskCountActivity()
{
}

void CHThorDiskCountActivity::ready()       
{ 
    PARENT::ready(); 
    finished = false;
    stopAfter = helper.getChooseNLimit();
    if (!helper.hasFilter())
        remoteLimit = stopAfter;
}

void CHThorDiskCountActivity::gatherInfo(IFileDescriptor * fd)
{
    PARENT::gatherInfo(fd);
    assertex(!grouped);
}


const void *CHThorDiskCountActivity::nextRow()
{
    if (finished) return NULL;

    unsigned __int64 totalCount = 0;
    if (fieldFilters.ordinality() == 0 && !helper.hasFilter() &&
        (fixedDiskRecordSize != 0) && !(helper.getFlags() & (TDXtemporary | TDXjobtemp)) &&
        !((helper.getFlags() & TDXcompress) && agent.queryResolveFilesLocally()) )
    {
        resolve();
        if (segHelper.canMatchAny() && ldFile)
        {
            try
            {
                unsigned __int64 size = ldFile->getFileSize();
                if (size % fixedDiskRecordSize)
                    throw MakeStringException(0, "Physical file %s has size %" I64F "d which is not a multiple of record size %d", ldFile->queryLogicalName(), size, fixedDiskRecordSize);
                totalCount = size / fixedDiskRecordSize;
            }
            catch (IException * e)
            {
                if (!(helper.getFlags() & TDRoptional) || (e->errorCode() != DFSERR_CannotFindPartFileSize))
                    throw;
                e->Release();
            }
        }
    }
    else
    {
        if (!opened) open();

        for (;;)
        {
            if (eofseen) 
                break;
            while (!prefetchBuffer.eos())
            {
                queryUpdateProgress();

                prefetcher->readAhead(prefetchBuffer);
                const byte * next = prefetchBuffer.queryRow();
                size32_t sizeRead = prefetchBuffer.queryRowSize();
                if (segMonitorsMatch(next))
                    totalCount += helper.numValid(next);
                prefetchBuffer.finishedRow();
                localOffset += sizeRead;
                if (totalCount > stopAfter)
                    break;
            }
            if (totalCount > stopAfter)
                break;
            eofseen = !openNext();
        }
        close();
    }

    if (totalCount > stopAfter)
        totalCount = stopAfter;
    finished = true;
    processed++;

    size32_t outSize = outputMeta.getFixedSize();
    void * ret = rowAllocator->createRow();
    if (outSize == 1)
    {
        assertex(stopAfter == 1);
        *(byte *)ret = (byte)totalCount;
    }
    else
    {
        assertex(outSize == sizeof(unsigned __int64));
        *(unsigned __int64 *)ret = totalCount;
    }
    return rowAllocator->finalizeRow(outSize, ret, outSize);
}

//=====================================================================================================

CHThorDiskGroupAggregateActivity::CHThorDiskGroupAggregateActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorDiskGroupAggregateArg &_arg, ThorActivityKind _kind, EclGraph & _graph, IPropertyTree *_node)
  : CHThorBinaryDiskReadBase(_agent, _activityId, _subgraphId, _arg, _arg, _kind, _node, _graph),
    helper(_arg), 
    aggregated(_arg, _arg)
{
}

void CHThorDiskGroupAggregateActivity::ready()      
{ 
    PARENT::ready(); 
    eof = false;
    gathered = false;
}

void CHThorDiskGroupAggregateActivity::gatherInfo(IFileDescriptor * fd)
{
    PARENT::gatherInfo(fd);
    assertex(!grouped);
    aggregated.start(rowAllocator, agent.queryCodeContext(), activityId);
}

void CHThorDiskGroupAggregateActivity::processRow(const void * next)
{
    aggregated.addRow(next);
}


const void *CHThorDiskGroupAggregateActivity::nextRow()
{
    if (eof)
        return NULL;

    try
    {
        if (!gathered)
        {
            if (!opened) open();
            while (!eofseen)
            {
                while (!prefetchBuffer.eos())
                {
                    queryUpdateProgress();

                    prefetcher->readAhead(prefetchBuffer);
                    const byte * next = prefetchBuffer.queryRow();
                    size32_t sizeRead = prefetchBuffer.queryRowSize();

                    if (segMonitorsMatch(next))
                   {
                        if (unlikely(translator))
                        {
                            MemoryBufferBuilder aBuilder(translatedRow.clear(), 0);
                            translator->translate(aBuilder, *this, next);
                            helper.processRow(aBuilder.getSelf(), this);
                        }
                        else
                            helper.processRow(next, this);
                    }

                    prefetchBuffer.finishedRow();
                    localOffset += sizeRead;
                }
                eofseen = !openNext();
            }
            close();
            gathered = true;
        }
    }
    catch(IException * e)
    {
        throw makeWrappedException(e);
    }

    Owned<AggregateRowBuilder> next = aggregated.nextResult();
    if (next)
    {
        processed++;
        return next->finalizeRowClear();
    }
    eof = true;
    return NULL;
}

//=====================================================================================================

CHThorCsvReadActivity::CHThorCsvReadActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorCsvReadArg &_arg, ThorActivityKind _kind, EclGraph & _graph, IPropertyTree *_node) : CHThorDiskReadBaseActivity(_agent, _activityId, _subgraphId, _arg, _kind, _node, _graph), helper(_arg)
{
    maxRowSize = agent.queryWorkUnit()->getDebugValueInt(OPT_MAXCSVROWSIZE, defaultMaxCsvRowSize) * 1024 * 1024;
    readType = rt_csv;
}

CHThorCsvReadActivity::~CHThorCsvReadActivity()
{
}

void CHThorCsvReadActivity::ready()
{
    PARENT::ready();
}

void CHThorCsvReadActivity::stop()
{
    csvSplitter.reset();
    PARENT::stop();
}

void CHThorCsvReadActivity::gatherInfo(IFileDescriptor * fd)
{
    PARENT::gatherInfo(fd);

    ICsvParameters * csvInfo = helper.queryCsvParameters();

    headerLines = csvInfo->queryHeaderLen();
    maxDiskSize = csvInfo->queryMaxSize();
    limit = helper.getRowLimit();
    if (helper.getFlags() & TDRlimitskips)
        limit = (unsigned __int64) -1;
    stopAfter = helper.getChooseNLimit();

    const char * quotes = NULL;
    const char * separators = NULL;
    const char * terminators = NULL;
    const char * escapes = NULL;
    IDistributedFile * dFile = ldFile?ldFile->queryDistributedFile():NULL;
    if (dFile)  //only makes sense for distributed (non local) files
    {
        IPropertyTree & options = dFile->queryAttributes();
        quotes = options.queryProp("@csvQuote");
        separators = options.queryProp("@csvSeparate");
        terminators = options.queryProp("@csvTerminate");
        escapes = options.queryProp("@csvEscape");
    }
    csvSplitter.init(helper.getMaxColumns(), csvInfo, quotes, separators, terminators, escapes);
}

void CHThorCsvReadActivity::calcFixedDiskRecordSize()
{
    fixedDiskRecordSize = 0;
}

const void *CHThorCsvReadActivity::nextRow()
{
    while (!stopAfter || (processed - initialProcessed) < stopAfter)
    {
        checkOpenNext();
        if (eofseen)
            break;
        size32_t thisLineLength = csvSplitter.splitLine(inputstream, maxRowSize);
        if (thisLineLength)
        {
            RtlDynamicRowBuilder rowBuilder(rowAllocator);
            unsigned thisSize;
            try
            {
                thisSize = helper.transform(rowBuilder, csvSplitter.queryLengths(), (const char * *)csvSplitter.queryData());
            }
            catch(IException * e)
            {
                throw makeWrappedException(e);
            }
            inputstream->skip(thisLineLength);
            localOffset += thisLineLength;
            if (thisSize)
            {
                OwnedConstRoxieRow ret = rowBuilder.finalizeRowClear(thisSize);
                if ((processed - initialProcessed) >= limit)
                {
                    if ( agent.queryCodeContext()->queryDebugContext())
                        agent.queryCodeContext()->queryDebugContext()->checkBreakpoint(DebugStateLimit, NULL, static_cast<IActivityBase *>(this));
                    helper.onLimitExceeded();
                    return NULL;
                }
                processed++;
                return ret.getClear();
            }
        }
    }
    close();
    return NULL;
}


bool CHThorCsvReadActivity::openNext()
{
    if (CHThorDiskReadBaseActivity::openNext())
    {
        unsigned lines = headerLines;
        while (lines-- && !inputstream->eos())
        {
            size32_t numAvailable;
            const void * next = inputstream->peek(maxDiskSize, numAvailable);
            inputstream->skip(csvSplitter.splitLine(numAvailable, (const byte *)next));
        }
        // only skip header in the first file - since spray doesn't duplicate the header.
        headerLines = 0;        
        return true;
    }
    return false;
}

void CHThorCsvReadActivity::checkOpenNext()
{
    agent.reportProgress(NULL);
    if (!opened)
    {
        agent.reportProgress(NULL);
        if (!helper.canMatchAny())
        {
            eofseen = true;
            opened = true;
        }
        else
            open();
    }

    for (;;)
    {
        if (eofseen || !inputstream->eos())
            return;

        eofseen = !openNext();
    }
}

//=====================================================================================================

CHThorXmlReadActivity::CHThorXmlReadActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorXmlReadArg &_arg, ThorActivityKind _kind, EclGraph & _graph, IPropertyTree *_node) : CHThorDiskReadBaseActivity(_agent, _activityId, _subgraphId, _arg, _kind, _node, _graph), helper(_arg)
{
    readType = (kind==TAKjsonread) ? rt_json : rt_xml;
}

void CHThorXmlReadActivity::ready()
{
    CHThorDiskReadBaseActivity::ready();
    rowTransformer.set(helper.queryTransformer());
    localOffset = 0;
    limit = helper.getRowLimit();
    if (helper.getFlags() & TDRlimitskips)
        limit = (unsigned __int64) -1;
    stopAfter = helper.getChooseNLimit();
}

void CHThorXmlReadActivity::stop()
{
    xmlParser.clear();
    CHThorDiskReadBaseActivity::stop();
}

void CHThorXmlReadActivity::gatherInfo(IFileDescriptor * fd)
{
    PARENT::gatherInfo(fd);
}

void CHThorXmlReadActivity::calcFixedDiskRecordSize()
{
    fixedDiskRecordSize = 0;
}

const void *CHThorXmlReadActivity::nextRow()
{
    if(!opened) open();
    while (!eofseen && (!stopAfter  || (processed - initialProcessed) < stopAfter))
    {
        agent.reportProgress(NULL);
        //call to next() will callback on the IXmlSelect interface
        bool gotNext = false;
        try
        {
            gotNext = xmlParser->next();
        }
        catch(IException * e)
        {
            throw makeWrappedException(e, inputfile->queryFilename());
        }
        if(!gotNext)
            eofseen = !openNext();
        else if (lastMatch)
        {
            RtlDynamicRowBuilder rowBuilder(rowAllocator);
            unsigned sizeGot;
            try
            {
                sizeGot = rowTransformer->transform(rowBuilder, lastMatch, this);
            }
            catch(IException * e)
            {
                throw makeWrappedException(e);
            }
            lastMatch.clear();
            localOffset = 0;
            if (sizeGot)
            {
                OwnedConstRoxieRow ret = rowBuilder.finalizeRowClear(sizeGot);
                if ((processed - initialProcessed) >= limit)
                {
                    if ( agent.queryCodeContext()->queryDebugContext())
                        agent.queryCodeContext()->queryDebugContext()->checkBreakpoint(DebugStateLimit, NULL, static_cast<IActivityBase *>(this));
                    helper.onLimitExceeded();
                    return NULL;
                }
                processed++;
                return ret.getClear();
            }
        }
    }
    return NULL;
}


bool CHThorXmlReadActivity::openNext()
{
    if (inputfileio)
        offsetOfPart += inputfileio->size();
    localOffset = 0;
    if (CHThorDiskReadBaseActivity::openNext())
    {
        unsigned readBufferSize = queryReadBufferSize();
        OwnedIFileIOStream inputfileiostream;
        if(readBufferSize)
            inputfileiostream.setown(createBufferedIOStream(inputfileio, readBufferSize));
        else
            inputfileiostream.setown(createIOStream(inputfileio));

        OwnedRoxieString xmlIterator(helper.getXmlIteratorPath());
        if (kind==TAKjsonread)
            xmlParser.setown(createJSONParse(*inputfileiostream, xmlIterator, *this, (0 != (TDRxmlnoroot & helper.getFlags()))?ptr_noRoot:ptr_none, (helper.getFlags() & TDRusexmlcontents) != 0));
        else
            xmlParser.setown(createXMLParse(*inputfileiostream, xmlIterator, *this, (0 != (TDRxmlnoroot & helper.getFlags()))?ptr_noRoot:ptr_none, (helper.getFlags() & TDRusexmlcontents) != 0));
        return true;
    }
    return false;
}

void CHThorXmlReadActivity::closepart()
{
    xmlParser.clear();
    CHThorDiskReadBaseActivity::closepart();
}

//---------------------------------------------------------------------------

CHThorLocalResultReadActivity::CHThorLocalResultReadActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorLocalResultReadArg &_arg, ThorActivityKind _kind, EclGraph & _graph, __int64 graphId) : CHThorSimpleActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(_arg)
{
    physicalRecordSize = outputMeta;
    grouped = outputMeta.isGrouped();
    graph = resolveLocalQuery(graphId);
    result = NULL;
}

void CHThorLocalResultReadActivity::ready()
{
    CHThorSimpleActivityBase::ready();
    result = graph->queryResult(helper.querySequence());
    curRow = 0;
}


const void *CHThorLocalResultReadActivity::nextRow()
{
    const void * next = result->queryRow(curRow++);
    if (next)
    {
        processed++;
        LinkRoxieRow(next);
        return next;
    }
    return NULL;
}

//=====================================================================================================

CHThorLocalResultWriteActivity::CHThorLocalResultWriteActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorLocalResultWriteArg &_arg, ThorActivityKind _kind, EclGraph & _graph, __int64 graphId)
 : CHThorActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(_arg)
{
    graph = resolveLocalQuery(graphId);
}

void CHThorLocalResultWriteActivity::execute()
{
    IHThorGraphResult * result = graph->createResult(helper.querySequence(), LINK(rowAllocator));
    for (;;)
    {
        const void *nextrec = input->nextRow();
        if (!nextrec)
        {
            nextrec = input->nextRow();
            if (!nextrec)
                break;
            result->addRowOwn(NULL);
        }
        result->addRowOwn(nextrec);
    }
}

//=====================================================================================================

CHThorDictionaryResultWriteActivity::CHThorDictionaryResultWriteActivity (IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorDictionaryResultWriteArg &_arg, ThorActivityKind _kind, EclGraph & _graph, __int64 graphId)
 : CHThorActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(_arg)
{
    graph = resolveLocalQuery(graphId);
}

void CHThorDictionaryResultWriteActivity::execute()
{
    RtlLinkedDictionaryBuilder builder(rowAllocator, helper.queryHashLookupInfo());
    for (;;)
    {
        const void *row = input->nextRow();
        if (!row)
        {
            row = input->nextRow();
            if (!row)
                break;
        }
        builder.appendOwn(row);
    }
    IHThorGraphResult * result = graph->createResult(helper.querySequence(), LINK(rowAllocator));
    size32_t dictSize = builder.getcount();
    const byte ** dictRows = builder.queryrows();
    for (size32_t row = 0; row < dictSize; row++)
    {
        const byte *thisRow = dictRows[row];
        if (thisRow)
            LinkRoxieRow(thisRow);
        result->addRowOwn(thisRow);
    }
}

//=====================================================================================================

CHThorLocalResultSpillActivity::CHThorLocalResultSpillActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorLocalResultSpillArg &_arg, ThorActivityKind _kind, EclGraph & _graph, __int64 graphId)
 : CHThorSimpleActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(_arg)
{
    result = NULL;
    nullPending = false;
    graph = resolveLocalQuery(graphId);
    assertex(graph);
}

void CHThorLocalResultSpillActivity::ready()
{
    CHThorSimpleActivityBase::ready(); 
    result = graph->createResult(helper.querySequence(), LINK(rowAllocator));
    nullPending = false;
}


const void * CHThorLocalResultSpillActivity::nextRow()
{
    const void * ret = input->nextRow();
    if (ret)
    {
        if (nullPending)
        {
            result->addRowOwn(NULL);
            nullPending = false;
        }
        LinkRoxieRow(ret);
        result->addRowOwn(ret);
        processed++;
    }
    else
        nullPending = true;

    return ret;
}

void CHThorLocalResultSpillActivity::stop()
{
    for (;;)
    {
        const void * ret = input->nextRow();
        if (!ret)
        {
            if (nullPending)
                break;
            nullPending = true;
        }
        else
        {
            if (nullPending)
            {
                result->addRowOwn(NULL);
                nullPending = false;
            }
            result->addRowOwn(ret);
        }
    }
    CHThorSimpleActivityBase::stop(); 
}


//=====================================================================================================

CHThorLoopActivity::CHThorLoopActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorLoopArg &_arg, ThorActivityKind _kind, EclGraph & _graph)
 : CHThorSimpleActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(_arg)
{
    flags = helper.getFlags();
    maxIterations = 0;
}

CHThorLoopActivity::~CHThorLoopActivity()
{
    ForEachItemIn(idx, loopPending)
        ReleaseRoxieRow(loopPending.item(idx));
}

void CHThorLoopActivity::ready()
{
    curInput = &input->queryStream();
    eof = false;
    loopCounter = 1;
    CHThorSimpleActivityBase::ready(); 
    maxIterations = helper.numIterations();
    if ((int)maxIterations < 0) maxIterations = 0;
    finishedLooping = ((kind == TAKloopcount) && (maxIterations == 0));
    if ((flags & IHThorLoopArg::LFnewloopagain) && !helper.loopFirstTime())
        finishedLooping = true;
    extractBuilder.clear();
    helper.createParentExtract(extractBuilder);
}


const void * CHThorLoopActivity::nextRow()
{
    if (eof)
        return NULL;

    unsigned emptyIterations = 0;
    for (;;)
    {
        for (;;)
        {
            const void * ret = curInput->nextRow();
            if (!ret)
            {
                ret = curInput->nextRow();      // more cope with groups somehow....
                if (!ret)
                {
                    if (finishedLooping)
                    {
                        eof = true;
                        return NULL;
                    }
                    break;
                }
            }

            if (finishedLooping || 
                ((flags & IHThorLoopArg::LFfiltered) && !helper.sendToLoop(loopCounter, ret)))
            {
                processed++;
                return ret;
            }
            loopPending.append(ret);
        }

        switch (kind)
        {
        case TAKloopdataset:
            {
                if (!(flags & IHThorLoopArg::LFnewloopagain))
                {
                    if (!helper.loopAgain(loopCounter, loopPending.ordinality(), (const void * *)loopPending.getArray()))
                    {
                        if (loopPending.ordinality() == 0)
                        {
                            eof = true;
                            return NULL;
                        }

                        arrayInput.init(&loopPending);
                        curInput = &arrayInput;
                        finishedLooping = true;
                        continue;       // back to the input loop again
                    }
                }
                break;
            }
        case TAKlooprow:
            if (loopPending.empty())
            {
                finishedLooping = true;
                eof = true;
                return NULL;
            }
            break;
        }

        if (loopPending.ordinality())
            emptyIterations = 0;
        else
        {
            //note: any outputs which didn't go around the loop again, would return the record, reinitializing emptyIterations
            emptyIterations++;
            if (emptyIterations > EMPTY_LOOP_LIMIT)
                throw MakeStringException(0, "Executed LOOP with empty input and output %u times", emptyIterations);
            if (emptyIterations % 32 == 0)
                DBGLOG("Executing LOOP with empty input and output %u times", emptyIterations);
        }

        void * counterRow = NULL;
        if (flags & IHThorLoopArg::LFcounter)
        {
            counterRow = queryRowManager()->allocate(sizeof(thor_loop_counter_t), activityId);
            *((thor_loop_counter_t *)counterRow) = loopCounter;
        }

        Owned<IHThorGraphResults> curResults = loopGraph->execute(counterRow, loopPending, extractBuilder.getbytes());
        if (flags & IHThorLoopArg::LFnewloopagain)
        {
            IHThorGraphResult * result = curResults->queryResult(helper.loopAgainResult());
            assertex(result);
            const void * row = result->queryRow(0);
            assertex(row);
            //Result is a row which contains a single boolean field.
            if (!((const bool *)row)[0])
                finishedLooping = true;
        }
        resultInput.init(curResults->queryResult(0));
        curInput = &resultInput;

        loopCounter++;
        if ((kind == TAKloopcount) && (loopCounter > maxIterations))
            finishedLooping = true;
    }
}


void CHThorLoopActivity::stop()
{
    ForEachItemIn(idx, loopPending)
        ReleaseRoxieRow(loopPending.item(idx));
    loopPending.kill();
    CHThorSimpleActivityBase::stop(); 
}

//---------------------------------------------------------------------------

CHThorGraphLoopResultReadActivity::CHThorGraphLoopResultReadActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorGraphLoopResultReadArg &_arg, ThorActivityKind _kind, EclGraph & _graph, __int64 graphId) : CHThorSimpleActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(&_arg)
{
    physicalRecordSize = outputMeta;
    grouped = outputMeta.isGrouped();
    result = NULL;
    graph = resolveLocalQuery(graphId);
}

CHThorGraphLoopResultReadActivity::CHThorGraphLoopResultReadActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorArg & _arg, ThorActivityKind _kind, EclGraph & _graph, __int64 graphId, unsigned _sequence, bool _grouped) : CHThorSimpleActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(NULL)
{
    physicalRecordSize = outputMeta;
    sequence = _sequence;
    grouped = _grouped;
    result = NULL;
    graph = resolveLocalQuery(graphId);
}

void CHThorGraphLoopResultReadActivity::ready()
{
    CHThorSimpleActivityBase::ready();
    if (helper)
        sequence = helper->querySequence();
    if ((int)sequence >= 0)
        result = graph->queryGraphLoopResult(sequence);
    else
        result = NULL;
    curRow = 0;
}


const void *CHThorGraphLoopResultReadActivity::nextRow()
{
    if (result)
    {
        const void * next = result->queryRow(curRow++);
        if (next)
        {
            processed++;
            LinkRoxieRow(next);
            return (void *)next;
        }
    }
    return NULL;
}

//=====================================================================================================

CHThorGraphLoopResultWriteActivity::CHThorGraphLoopResultWriteActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorGraphLoopResultWriteArg &_arg, ThorActivityKind _kind, EclGraph & _graph, __int64 graphId)
 : CHThorActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph)
{
    graph = resolveLocalQuery(graphId);
}

void CHThorGraphLoopResultWriteActivity::execute()
{
    IHThorGraphResult * result = graph->createGraphLoopResult(LINK(rowAllocator));
    for (;;)
    {
        const void *nextrec = input->nextRow();
        if (!nextrec)
        {
            nextrec = input->nextRow();
            if (!nextrec)
                break;
            result->addRowOwn(NULL);
        }
        result->addRowOwn(nextrec);
    }
}

//=====================================================================================================

class CCounterMeta : implements IOutputMetaData, public CInterface
{
public:
    IMPLEMENT_IINTERFACE

    virtual size32_t getRecordSize(const void *rec)         { return sizeof(thor_loop_counter_t); }
    virtual size32_t getMinRecordSize() const               { return sizeof(thor_loop_counter_t); }
    virtual size32_t getFixedSize() const                   { return sizeof(thor_loop_counter_t); }
    virtual void toXML(const byte * self, IXmlWriter & out) { }
    virtual unsigned getVersion() const                     { return OUTPUTMETADATA_VERSION; }
    virtual unsigned getMetaFlags()                         { return 0; }
    virtual const RtlTypeInfo * queryTypeInfo() const { return nullptr; }
    virtual void destruct(byte * self)  {}
    virtual IOutputRowSerializer * createDiskSerializer(ICodeContext * ctx, unsigned activityId) { return NULL; }
    virtual IOutputRowDeserializer * createDiskDeserializer(ICodeContext * ctx, unsigned activityId) { return NULL; }
    virtual ISourceRowPrefetcher * createDiskPrefetcher() { return NULL; }
    virtual IOutputMetaData * querySerializedDiskMeta() { return this; }
    virtual IOutputRowSerializer * createInternalSerializer(ICodeContext * ctx, unsigned activityId) { return NULL; }
    virtual IOutputRowDeserializer * createInternalDeserializer(ICodeContext * ctx, unsigned activityId) { return NULL; }
    virtual void process(const byte * self, IFieldProcessor & target, unsigned from, unsigned to) {}
    virtual void walkIndirectMembers(const byte * self, IIndirectMemberVisitor & visitor) {}
    virtual IOutputMetaData * queryChildMeta(unsigned i) { return NULL; }
    virtual const RtlRecord &queryRecordAccessor(bool expand) const { throwUnexpected(); } // could provide a static implementation if needed
};

//=====================================================================================================

CHThorGraphLoopActivity::CHThorGraphLoopActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorGraphLoopArg &_arg, ThorActivityKind _kind, EclGraph & _graph)
 : CHThorSimpleActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(_arg)
{
    flags = helper.getFlags();
    maxIterations = 0;
    counterMeta.setown(new CCounterMeta);
}

void CHThorGraphLoopActivity::ready()
{
    executed = false;
    resultIndex = 0;
    CHThorSimpleActivityBase::ready(); 
    maxIterations = helper.numIterations();
    if ((int)maxIterations < 0) maxIterations = 0;
    loopResults.setown(agent.createGraphLoopResults());
    extractBuilder.clear();
    helper.createParentExtract(extractBuilder);
    rowAllocator.setown(agent.queryCodeContext()->getRowAllocator(queryOutputMeta(), activityId));
    rowAllocatorCounter.setown(agent.queryCodeContext()->getRowAllocator(counterMeta, activityId));
}


const void * CHThorGraphLoopActivity::nextRow()
{
    if (!executed)
    {
        executed = true;

        IHThorGraphResult * inputResult = loopResults->createResult(0, LINK(rowAllocator));
        for (;;)
        {
            const void * ret = input->nextRow();
            if (!ret)
            {
                ret = input->nextRow();
                if (!ret)
                    break;
                inputResult->addRowOwn(NULL);
            }
            inputResult->addRowOwn(ret);
        }

        for (unsigned loopCounter = 1; loopCounter <= maxIterations; loopCounter++)
        {
            void * counterRow = NULL;
            if (flags & IHThorGraphLoopArg::GLFcounter)
            {
                counterRow = rowAllocatorCounter->createRow();
                *((thor_loop_counter_t *)counterRow) = loopCounter;
                counterRow = rowAllocatorCounter->finalizeRow(sizeof(thor_loop_counter_t), counterRow, sizeof(thor_loop_counter_t));
            }
            loopGraph->execute(counterRow, loopResults, extractBuilder.getbytes());
        }

        int iNumResults = loopResults->ordinality();
        finalResult = loopResults->queryResult(iNumResults-1); //Get the last result, which isnt necessarily 'maxIterations'
    }

    const void * next = finalResult->getOwnRow(resultIndex++);
    if (next)
        processed++;
    return next;
}


void CHThorGraphLoopActivity::stop()
{
    rowAllocator.clear();
    finalResult = NULL;
    loopResults.clear();
    CHThorSimpleActivityBase::stop(); 
}

//=====================================================================================================

CHThorParallelGraphLoopActivity::CHThorParallelGraphLoopActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorGraphLoopArg &_arg, ThorActivityKind _kind, EclGraph & _graph)
 : CHThorSimpleActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(_arg)
{
    flags = helper.getFlags();
    maxIterations = 0;
}

void CHThorParallelGraphLoopActivity::ready()
{
    executed = false;
    resultIndex = 0;
    CHThorSimpleActivityBase::ready(); 
    maxIterations = helper.numIterations();
    if ((int)maxIterations < 0) maxIterations = 0;
    loopResults.setown(agent.createGraphLoopResults());
    extractBuilder.clear();
    helper.createParentExtract(extractBuilder);
    rowAllocator.setown(agent.queryCodeContext()->getRowAllocator(queryOutputMeta(), activityId));
}


const void * CHThorParallelGraphLoopActivity::nextRow()
{
    if (!executed)
    {
        executed = true;

        IHThorGraphResult * inputResult = loopResults->createResult(0, LINK(rowAllocator));
        for (;;)
        {
            const void * ret = input->nextRow();
            if (!ret)
            {
                ret = input->nextRow();
                if (!ret)
                    break;
                inputResult->addRowOwn(NULL);
            }
            inputResult->addRowOwn(ret);
        }

//      The lack of separation between pre-creation and creation means this would require cloning lots of structures.
//      not implemented for the moment.
//      loopGraph->executeParallel(loopResults, extractBuilder.getbytes(), maxIterations);

        finalResult = loopResults->queryResult(maxIterations);
    }

    const void * next = finalResult->getOwnRow(resultIndex++);
    if (next)
        processed++;
    return next;
}


void CHThorParallelGraphLoopActivity::stop()
{
    rowAllocator.clear();
    finalResult = NULL;
    loopResults.clear();
    CHThorSimpleActivityBase::stop(); 
}

//=====================================================================================================

LibraryCallOutput::LibraryCallOutput(CHThorLibraryCallActivity * _owner, unsigned _output, IOutputMetaData * _meta) : owner(_owner), output(_output), meta(_meta)
{
    processed = 0;
}

const void * LibraryCallOutput::nextRow()
{
    if (!gotRows)
    {
        result.set(owner->getResultRows(output));
        gotRows = true;
    }

    const void * ret = result->getOwnRow(curRow++);
    if (ret)
        processed++;
    return ret;
}

bool LibraryCallOutput::isGrouped()
{
    return meta->isGrouped();
}

IOutputMetaData * LibraryCallOutput::queryOutputMeta() const
{
    return meta;
}

void LibraryCallOutput::ready()
{
    owner->ready();
    gotRows = false;
    result.clear();
    curRow = 0;
}

void LibraryCallOutput::stop()
{
    owner->stop();
    result.clear();
}

void LibraryCallOutput::resetEOF()
{
    throwUnexpected();
}

void LibraryCallOutput::updateProgress(IStatisticGatherer &progress) const
{
    owner->updateOutputProgress(progress, *this, processed);
}


CHThorLibraryCallActivity::CHThorLibraryCallActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorLibraryCallArg &_arg, ThorActivityKind _kind, EclGraph & _graph, IPropertyTree * node)
 : CHThorSimpleActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(_arg)
{
    libraryName.set(node->queryProp("att[@name=\"libname\"]/@value"));
    interfaceHash = node->getPropInt("att[@name=\"_interfaceHash\"]/@value", 0);
    bool embedded = node->getPropBool("att[@name=\"embedded\"]/@value", false) ;
    if (embedded)
    {
        embeddedGraphName.set(node->queryProp("att[@name=\"graph\"]/@value"));
        if (!embeddedGraphName)
            embeddedGraphName.set(libraryName);
    }

    Owned<IPropertyTreeIterator> iter = node->getElements("att[@name=\"_outputUsed\"]");
    ForEach(*iter)
    {
        unsigned whichOutput = iter->query().getPropInt("@value");
        IOutputMetaData * meta = helper.queryOutputMeta(whichOutput);
        outputs.append(*new LibraryCallOutput(this, whichOutput, meta));
    }

    state = StateCreated;
}

IHThorGraphResult * CHThorLibraryCallActivity::getResultRows(unsigned whichOutput)
{
    CriticalBlock procedure(cs);

    if (!results)
    {
        if (libraryName.length() == 0)
            libraryName.setown(helper.getLibraryName());
        helper.createParentExtract(extractBuilder);
        results.setown(agent.executeLibraryGraph(libraryName, interfaceHash, activityId, embeddedGraphName, extractBuilder.getbytes()));
    }

    return results->queryResult(whichOutput);
}


IHThorInput * CHThorLibraryCallActivity::queryOutput(unsigned idx)
{
    assert(outputs.isItem(idx));
    return &outputs.item(idx);
}

void CHThorLibraryCallActivity::updateOutputProgress(IStatisticGatherer &progress, const LibraryCallOutput & _output, unsigned __int64 numProcessed) const
{
    LibraryCallOutput & output = const_cast<LibraryCallOutput &>(_output);
    updateProgressForOther(progress, activityId, subgraphId, outputs.find(output), numProcessed);
}


void CHThorLibraryCallActivity::ready()
{
    CriticalBlock procedure(cs);
    if (state != StateReady)
    {
        results.clear();
        CHThorSimpleActivityBase::ready();
        state = StateReady;
    }
}


const void * CHThorLibraryCallActivity::nextRow()
{
    throwUnexpected();
}


void CHThorLibraryCallActivity::stop()
{
    CriticalBlock procedure(cs);
    if (state != StateDone)
    {
        results.clear();
        CHThorSimpleActivityBase::stop(); 
    }
}


//=====================================================================================================

class CHThorNWayInputActivity : public CHThorSimpleActivityBase, implements IHThorNWayInput
{
    IHThorNWayInputArg & helper;
    InputArrayType inputs;
    InputArrayType selectedInputs;

public:
    CHThorNWayInputActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorNWayInputArg &_arg, ThorActivityKind _kind, EclGraph & _graph) : CHThorSimpleActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(_arg)
    {
    }

    virtual void ready()
    {
        bool selectionIsAll;
        size32_t selectionLen;
        rtlDataAttr selection;
        helper.getInputSelection(selectionIsAll, selectionLen, selection.refdata());
        selectedInputs.kill();
        if (selectionIsAll)
        {
            ForEachItemIn(i, inputs)
                selectedInputs.append(inputs.item(i));
        }
        else
        {
            const size32_t * selections = (const size32_t *)selection.getdata();
            unsigned max = selectionLen/sizeof(size32_t);
            for (unsigned i = 0; i < max; i++)
            {
                unsigned nextIndex = selections[i];
                //Check there are no duplicates.....  Assumes there are a fairly small number of inputs, so n^2 search is ok.
                for (unsigned j=i+1; j < max; j++)
                {
                    if (nextIndex == selections[j])
                        throw MakeStringException(100, "Selection list for nway input can not contain duplicates");
                }
                if (!inputs.isItem(nextIndex-1))
                    throw MakeStringException(100, "Index %d in RANGE selection list is out of range", nextIndex);

                selectedInputs.append(inputs.item(nextIndex-1));
            }
        }

        ForEachItemIn(i2, selectedInputs)
            selectedInputs.item(i2)->ready();
    }

    virtual void setInput(unsigned idx, IHThorInput *_in)
    {
        assertex(idx == inputs.ordinality());
        inputs.append(_in);
    }

    virtual const void * nextRow()
    {
        throwUnexpected();
    }

    virtual void updateProgress(IStatisticGatherer &progress) const
    {
//      CHThorSimpleActivityBase::updateProgress(progress);
        ForEachItemIn(i, inputs)
            inputs.item(i)->updateProgress(progress);
    }

    virtual unsigned numConcreteOutputs() const
    {
        return selectedInputs.ordinality();
    }

    virtual IHThorInput * queryConcreteInput(unsigned idx) const
    {
        if (selectedInputs.isItem(idx))
            return selectedInputs.item(idx);
        return NULL;
    }
};

//=====================================================================================================

class CHThorNWayGraphLoopResultReadActivity : public CHThorSimpleActivityBase, implements IHThorNWayInput
{
    IHThorNWayGraphLoopResultReadArg & helper;
    CIArrayOf<CHThorActivityBase> inputs;
    __int64 graphId;
    bool grouped;

public:
    CHThorNWayGraphLoopResultReadActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorNWayGraphLoopResultReadArg &_arg, ThorActivityKind _kind, EclGraph & _graph, __int64 _graphId) : CHThorSimpleActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(_arg)
    {
        grouped = helper.isGrouped();
        graphId = _graphId;
    }

    virtual bool isGrouped() 
    { 
        return grouped; 
    }

    virtual void ready()
    {
        bool selectionIsAll;
        size32_t selectionLen;
        rtlDataAttr selection;
        helper.getInputSelection(selectionIsAll, selectionLen, selection.refdata());
        if (selectionIsAll)
            throw MakeStringException(100, "ALL not yet supported for NWay graph inputs");

        unsigned max = selectionLen / sizeof(size32_t);
        const size32_t * selections = (const size32_t *)selection.getdata();
        for (unsigned i = 0; i < max; i++)
        {
            CHThorActivityBase * resultInput = new CHThorGraphLoopResultReadActivity(agent, activityId, subgraphId, helper, kind, graph, graphId, selections[i], grouped);
            inputs.append(*resultInput);
            resultInput->ready();
        }
    }

    virtual void stop()
    {
        inputs.kill();
    }

    virtual void setInput(unsigned idx, IHThorInput *_in)
    {
        throwUnexpected();
    }

    virtual const void * nextRow()
    {
        throwUnexpected();
    }

    virtual unsigned numConcreteOutputs() const
    {
        return inputs.ordinality();
    }

    virtual IHThorInput * queryConcreteInput(unsigned idx) const
    {
        if (inputs.isItem(idx))
            return &inputs.item(idx);
        return NULL;
    }
};

//=====================================================================================================

CHThorNWaySelectActivity::CHThorNWaySelectActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorNWaySelectArg &_arg, ThorActivityKind _kind, EclGraph & _graph) : CHThorMultiInputActivity(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(_arg)
{
    selectedInput = NULL;
}

void CHThorNWaySelectActivity::stop()
{
    selectedInput = NULL;
    CHThorMultiInputActivity::stop();
}

void CHThorNWaySelectActivity::ready()
{
    CHThorMultiInputActivity::ready();
    unsigned whichInput = helper.getInputIndex();

    selectedInput = NULL;
    if (whichInput--)
    {
        ForEachItemIn(i, inputs)
        {
            IHThorInput * cur = inputs.item(i);
            IHThorNWayInput * nWayInput = dynamic_cast<IHThorNWayInput *>(cur);
            if (nWayInput)
            {
                unsigned numRealInputs = nWayInput->numConcreteOutputs();
                if (whichInput < numRealInputs)
                    selectedInput = nWayInput->queryConcreteInput(whichInput);
                whichInput -= numRealInputs;
            }
            else
            {
                if (whichInput == 0)
                    selectedInput = cur;
                whichInput -= 1;
            }
            if (selectedInput)
                break;
        }
    }
}

const void * CHThorNWaySelectActivity::nextRow()
{
    if (!selectedInput)
        return NULL;
    return selectedInput->nextRow();
}


const void * CHThorNWaySelectActivity::nextRowGE(const void * seek, unsigned numFields, bool &wasCompleteMatch, const SmartStepExtra &stepExtra)
{
    if (!selectedInput)
        return NULL;
    return selectedInput->nextRowGE(seek, numFields, wasCompleteMatch, stepExtra);
}

IInputSteppingMeta * CHThorNWaySelectActivity::querySteppingMeta()
{
    if (selectedInput)
        return selectedInput->querySteppingMeta();
    return NULL;
}

//=====================================================================================================
CHThorStreamedIteratorActivity::CHThorStreamedIteratorActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorStreamedIteratorArg &_arg, ThorActivityKind _kind, EclGraph & _graph)
    : CHThorSimpleActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(_arg)
{
}

void CHThorStreamedIteratorActivity::ready()
{
    CHThorSimpleActivityBase::ready();
    rows.setown(helper.createInput());
}

const void *CHThorStreamedIteratorActivity::nextRow()
{
    assertex(rows);
    const void * next = rows->nextRow();
    if (next)
        processed++;
    return next;
}

void CHThorStreamedIteratorActivity::stop()
{
    if (rows)
    {
        rows->stop();
        rows.clear();
    }
}


//=====================================================================================================

CHThorExternalActivity::CHThorExternalActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorExternalArg &_arg, ThorActivityKind _kind, EclGraph & _graph, IPropertyTree * _graphNode)
: CHThorMultiInputActivity(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(_arg), graphNode(_graphNode), activityContext(1, 0)
{
}

void CHThorExternalActivity::setInput(unsigned index, IHThorInput *_input)
{
    CHThorMultiInputActivity::setInput(index, _input);
    CHThorInputAdaptor * adaptedInput = new CHThorInputAdaptor(_input);
    inputAdaptors.append(*adaptedInput);
    helper.setInput(index, adaptedInput);
}

void CHThorExternalActivity::ready()
{
    CHThorMultiInputActivity::ready();
    if (kind != TAKexternalsink)
        rows.setown(helper.createOutput(&activityContext));
}

const void *CHThorExternalActivity::nextRow()
{
    assertex(rows);
    const void * next = rows->nextRow();
    if (next)
        processed++;
    return next;
}

void CHThorExternalActivity::execute()
{
    assertex(!rows);
    helper.execute(&activityContext);
}

void CHThorExternalActivity::stop()
{
    if (rows)
    {
        rows->stop();
        rows.clear();
    }
    CHThorMultiInputActivity::stop();
}


//=====================================================================================================

CHThorNewDiskReadBaseActivity::CHThorNewDiskReadBaseActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorNewDiskReadBaseArg &_arg, IHThorCompoundBaseArg & _segHelper, ThorActivityKind _kind, IPropertyTree *_node, EclGraph & _graph)
: CHThorActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(_arg), segHelper(_segHelper)
{
    helper.setCallback(this);
    expectedDiskMeta = helper.queryDiskRecordSize();
    projectedDiskMeta = helper.queryProjectedDiskRecordSize();
    formatOptions.setown(createPTree());
    isCodeSigned = false;
    if (_node)
    {
        const char *recordTranslationModeHintText = _node->queryProp("hint[@name='layouttranslation']/@value");
        if (recordTranslationModeHintText)
            recordTranslationModeHint = getTranslationMode(recordTranslationModeHintText, true);
        isCodeSigned = isActivityCodeSigned(*_node);
    }

    CPropertyTreeWriter writer(formatOptions);
    helper.getFormatOptions(writer);
}

CHThorNewDiskReadBaseActivity::~CHThorNewDiskReadBaseActivity()
{
    close();
}

void CHThorNewDiskReadBaseActivity::ready()
{
    CHThorActivityBase::ready();

    opened = false;
    offsetOfPart = 0;
    partNum = (unsigned)-1;

    resolveFile();

    fieldFilters.kill();
    segHelper.createSegmentMonitors(this);
}

void CHThorNewDiskReadBaseActivity::stop()
{
    close();
    CHThorActivityBase::stop();
}

unsigned __int64 CHThorNewDiskReadBaseActivity::getFilePosition(const void * row)
{
    //Ideally these functions would not need to be implemented - they should always be implemented by the translation layer
    throwUnexpected();
}

unsigned __int64 CHThorNewDiskReadBaseActivity::getLocalFilePosition(const void * row)
{
    throwUnexpected();
}

const char * CHThorNewDiskReadBaseActivity::queryLogicalFilename(const void * row)
{
    throwUnexpected();
}

void CHThorNewDiskReadBaseActivity::resolveFile()
{
    //If in a child query, and the filenames haven't changed, the information about the resolved filenames will also not have changed
    //MORE: Is this ever untrue?
    if (subfiles && !(helper.getFlags() & (TDXvarfilename|TDRdynformatoptions)))
        return;

    //Only clear these members if we are re-resolving the file - otherwise the previous entries are still valid
    ldFile.clear();
    tempFileName.clear();
    dfsParts.clear();
    subfiles.kill();

    Owned<IPropertyTree> curFormatOptions;
    if (helper.getFlags() & TDRdynformatoptions)
    {
        curFormatOptions.setown(createPTreeFromIPT(formatOptions));
        CPropertyTreeWriter writer(curFormatOptions);
        helper.getFormatDynOptions(writer);
    }
    else
        curFormatOptions.set(formatOptions);

    OwnedRoxieString fileName(helper.getFileName());
    mangleHelperFileName(mangledHelperFileName, fileName, agent.queryWuid(), helper.getFlags());
    if (helper.getFlags() & (TDXtemporary | TDXjobtemp))
    {
        StringBuffer mangledFilename;
        mangleLocalTempFilename(mangledFilename, mangledHelperFileName.str(), nullptr);
        tempFileName.set(agent.queryTemporaryFile(mangledFilename.str()));
        logicalFileName = tempFileName.str();
        gatherInfo(NULL);
        subfiles.append(*extractFileInformation(nullptr, curFormatOptions));
    }
    else
    {
        ldFile.setown(resolveLFNFlat(agent, mangledHelperFileName.str(), "Read", 0 != (helper.getFlags() & TDRoptional), isCodeSigned));
        if ( mangledHelperFileName.charAt(0) == '~')
            logicalFileName = mangledHelperFileName.str()+1;
        else
            logicalFileName = mangledHelperFileName.str();

        if (ldFile)
        {
            Owned<IFileDescriptor> fdesc;
            fdesc.setown(ldFile->getFileDescriptor());
            gatherInfo(fdesc);
            IDistributedFile *dFile = ldFile->queryDistributedFile();
            if (dFile)  //only makes sense for distributed (non local) files
            {
                dfsParts.setown(dFile->getIterator());
                IDistributedSuperFile *super = dFile->querySuperFile();
                if (super)
                {
                    unsigned numsubs = super->numSubFiles(true);
                    unsigned s=0;
                    for (; s<numsubs; s++)
                    {
                        IDistributedFile &subfile = super->querySubFile(s, true);
                        subfiles.append(*extractFileInformation(&subfile, curFormatOptions));
                    }
                    assertex(fdesc);
                    superfile.set(fdesc->querySuperFileDescriptor());
                }
                else
                    subfiles.append(*extractFileInformation(dFile, curFormatOptions));

                if((helper.getFlags() & (TDXtemporary | TDXjobtemp)) == 0)
                    agent.logFileAccess(dFile, "HThor", "READ", graph);
            }
            else
                subfiles.append(*extractFileInformation(nullptr, curFormatOptions));
        }
        else
            subfiles.append(*extractFileInformation(nullptr, curFormatOptions));

        if (!ldFile)
        {
            StringBuffer buff;
            buff.appendf("Input file '%s' was missing but declared optional", mangledHelperFileName.str());
            agent.addWuExceptionEx(buff.str(), WRN_SkipMissingOptFile, SeverityInformation, MSGAUD_user, "hthor");
        }
    }

    assertex(subfiles.ordinality() != 0);
}

void CHThorNewDiskReadBaseActivity::gatherInfo(IFileDescriptor * fileDesc)
{
    if (fileDesc)
    {
        if (!agent.queryResolveFilesLocally())
        {
            grouped = fileDesc->isGrouped();
            if (grouped != ((helper.getFlags() & TDXgrouped) != 0))
            {
                StringBuffer msg;
                msg.append("DFS and code generated group info. differs: DFS(").append(grouped ? "grouped" : "ungrouped").append("), CodeGen(").append(grouped ? "ungrouped" : "grouped").append("), using DFS info");
                agent.addWuExceptionEx(msg.str(), WRN_MismatchGroupInfo, SeverityError, MSGAUD_user, "hthor");
            }
        }
        else
            grouped = ((helper.getFlags() & TDXgrouped) != 0);
    }
    else
    {
        grouped = ((helper.getFlags() & TDXgrouped) != 0);
    }
}

static void queryInheritProp(IPropertyTree & target, const char * targetName, IPropertyTree & source, const char * sourceName)
{
    if (source.hasProp(sourceName) && !target.hasProp(targetName))
        target.setProp(targetName, source.queryProp(sourceName));
}

static void queryInheritSeparatorProp(IPropertyTree & target, const char * targetName, IPropertyTree & source, const char * sourceName)
{
    //Legacy - commas are quoted if they occur in a separator list, so need to remove the leading backslashes
    if (source.hasProp(sourceName) && !target.hasProp(targetName))
    {
        StringBuffer unquoted;
        const char * text = source.queryProp(sourceName);
        while (*text)
        {
            if ((text[0] == '\\') && (text[1] == ','))
                text++;
            unquoted.append(*text++);
        }
        target.setProp(targetName, unquoted);
    }
}

CHThorNewDiskReadBaseActivity::InputFileInfo * CHThorNewDiskReadBaseActivity::extractFileInformation(IDistributedFile * distributedFile, const IPropertyTree * curFormatOptions)
{
    Owned<IPropertyTree> meta = createPTree();
    unsigned actualCrc = helper.getDiskFormatCrc();
    Linked<IOutputMetaData> actualDiskMeta = expectedDiskMeta;
    Linked<IPropertyTree> fileFormatOptions = createPTreeFromIPT(curFormatOptions);
    bool compressed = false;
    bool blockcompressed = false;
    const char * readFormat = helper.queryFormat();

    if (distributedFile)
    {
        const char *kind = queryFileKind(distributedFile);
        //Do not use the field translation if the file was originally csv/xml - unless explicitly set
        if ((strisame(kind, "flat") || (RecordTranslationMode::AlwaysDisk == getLayoutTranslationMode())) &&
//            (strisame(readFormat, "flat") || strisame(kind, readFormat)))
              (strisame(readFormat, "flat"))) // Not sure about this - only allow fixed source format if reading as flat
        {
            //Yuk this will be horrible - it needs to cache it for each distributed file
            //and also common them up if they are the same.
            IPropertyTree &props = distributedFile->queryAttributes();
            Owned<IOutputMetaData> publishedMeta = getDaliLayoutInfo(props);
            if (publishedMeta)
            {
                actualDiskMeta.setown(publishedMeta.getClear());
                actualCrc = props.getPropInt("@formatCrc");
            }

            size32_t dfsSize = props.getPropInt("@recordSize");
            if (dfsSize != 0)
                meta->setPropInt("@recordSize", dfsSize);
        }
        compressed = distributedFile->isCompressed(&blockcompressed); //try new decompression, fall back to old unless marked as block

        //Check for encryption key
        void *k;
        size32_t kl;
        helper.getEncryptKey(kl,k);
        if (kl)
        {
            meta->setPropBin("encryptionKey", kl, k);
            blockcompressed = true;
            compressed = true;
        }

        //MORE: There should probably be a generic way of storing and extracting format options for a file
        IPropertyTree & options = distributedFile->queryAttributes();
        queryInheritProp(*fileFormatOptions, "quote", options, "@csvQuote");
        queryInheritSeparatorProp(*fileFormatOptions, "separator", options, "@csvSeparate");
        queryInheritProp(*fileFormatOptions, "terminator", options, "@csvTerminate");
        queryInheritProp(*fileFormatOptions, "escape", options, "@csvEscape");
        dbglogXML(fileFormatOptions);
        dbglogXML(fileFormatOptions);
    }

    meta->setPropBool("@grouped", grouped);
    meta->setPropBool("@compressed", compressed);
    meta->setPropBool("@blockCompressed", blockcompressed);
    meta->setPropBool("@forceCompressed", (helper.getFlags() & TDXcompress) != 0);
    meta->setPropTree("formatOptions", fileFormatOptions.getClear());

    InputFileInfo & target = * new InputFileInfo;
    target.file = distributedFile;
    target.meta.setown(meta.getClear());
    target.actualCrc = actualCrc;
    target.actualMeta.swap(actualDiskMeta);
    return &target;
}


void CHThorNewDiskReadBaseActivity::close()
{
    closepart();
    if(ldFile)
    {
        IDistributedFile * dFile = ldFile->queryDistributedFile();
        if(dFile)
            dFile->setAccessed();
    }
}

void CHThorNewDiskReadBaseActivity::closepart()
{
    if (activeReader)
    {
        activeReader->clearInput();
        activeReader = nullptr;
    }
    logicalFileName = "";
}

static void saveOrRelease(Owned<IException> & target, IException * e)
{
    if (target.get())
        ::Release(e);
    else
        target.setown(e);
}

static void getFilename(RemoteFilename & rfilename, IDistributedFilePart * curPart, ILocalOrDistributedFile * localFile, unsigned partNum, unsigned copy)
{
    if (curPart)
        curPart->getFilename(rfilename,copy);
    else
        localFile->getPartFilename(rfilename,partNum,copy);
}

bool CHThorNewDiskReadBaseActivity::openFirstPart()
{
    partNum = 0;
    if (dfsParts)       // more should really be fileDesc or something
    {
        if (dfsParts->first())
        {
            if (openFilePart(ldFile, &dfsParts->query(), 0))
                return true;
            return openNextPart(true);
        }
    }
    else if (ldFile)
    {
        if (ldFile->numParts() != 0)
        {
            if (openFilePart(ldFile, nullptr, 0))
                return true;
            return openNextPart(true);
        }
    }
    else if (!tempFileName.isEmpty())
    {
        if (openFilePart(tempFileName))
            return true;
    }

    setEmptyStream();
    return false;
}

bool CHThorNewDiskReadBaseActivity::openNextPart(bool prevWasMissing)
{
    if (finishedParts)
        return false;

    if (!prevWasMissing)
    {
        offset_t sizeFilePart = 0;
        if (dfsParts)
            sizeFilePart = dfsParts->query().getFileSize(true, false);
        else if (ldFile)
            sizeFilePart = ldFile->getPartFileSize(partNum);

        offsetOfPart += sizeFilePart;
        closepart();
    }

    for (;;)
    {
        partNum++;
        if (dfsParts)
        {
            if (dfsParts->next())
            {
                if (openFilePart(ldFile, &dfsParts->query(), partNum))
                    return true;

                continue; // try the next file part
            }
        }
        else if (ldFile)
        {
            if (partNum < ldFile->numParts())
            {
                if (openFilePart(ldFile, nullptr, partNum))
                    return true;

                continue; // try the next file part
            }
        }

        setEmptyStream();
        return false;
    }
}

void CHThorNewDiskReadBaseActivity::initStream(IDiskRowReader * reader, const char * filename)
{
    activeReader = reader;
    inputRowStream = reader->queryAllocatedRowStream(rowAllocator);

    StringBuffer report("Reading file ");
    report.append(filename);
    agent.reportProgress(report.str());
}

void CHThorNewDiskReadBaseActivity::setEmptyStream()
{
    inputRowStream = queryNullDiskRowStream();
    finishedParts = true;
}

IDiskRowReader * CHThorNewDiskReadBaseActivity::ensureRowReader(const char * format, bool streamRemote, unsigned expectedCrc, IOutputMetaData & expected, unsigned projectedCrc, IOutputMetaData & projected, unsigned actualCrc, IOutputMetaData & actual, const IPropertyTree * options)
{
    Owned<IDiskReadMapping> mapping = createDiskReadMapping(getLayoutTranslationMode(), format, actualCrc, actual, expectedCrc, expected, projectedCrc, projected, options);

    ForEachItemIn(i, readers)
    {
        IDiskRowReader & cur = readers.item(i);
        if (cur.matches(format, streamRemote, mapping))
            return &cur;
    }
    IDiskRowReader * reader = createDiskReader(format, streamRemote, mapping);
    readers.append(*reader);
    return reader;
}

bool CHThorNewDiskReadBaseActivity::openFilePart(const char * filename)
{
    const char * format = helper.queryFormat();   // more - should extract from the current file (could even mix flat and csv...)
    InputFileInfo * fileInfo = &subfiles.item(0);

    unsigned expectedCrc = helper.getDiskFormatCrc();
    unsigned projectedCrc = helper.getProjectedFormatCrc();
    IDiskRowReader * reader = ensureRowReader(format, false, expectedCrc, *expectedDiskMeta, projectedCrc, *projectedDiskMeta, expectedCrc, *expectedDiskMeta, fileInfo->meta);
    if (reader->setInputFile(filename, logicalFileName, 0, offsetOfPart, fileInfo->meta, fieldFilters))
    {
        initStream(reader, filename);
        return true;
    }
    return false;
}

bool CHThorNewDiskReadBaseActivity::openFilePart(ILocalOrDistributedFile * localFile, IDistributedFilePart * filePart, unsigned whichPart)
{
    IDistributedFile * distributedFile = localFile->queryDistributedFile();
    InputFileInfo * fileInfo = &subfiles.item(0);
    if (superfile && filePart)
    {
        unsigned subfile;
        unsigned lnum;
        if (superfile->mapSubPart(partNum, subfile, lnum))
        {
            fileInfo = &subfiles.item(subfile);
            distributedFile = fileInfo->file;
            logicalFileName = distributedFile->queryLogicalName();
        }
    }

    unsigned expectedCrc = helper.getDiskFormatCrc();
    unsigned projectedCrc = helper.getProjectedFormatCrc();
    unsigned actualCrc = fileInfo->actualCrc;
    IOutputMetaData * actualDiskMeta = fileInfo->actualMeta;

    bool tryRemoteStream = actualDiskMeta->queryTypeInfo()->canInterpret() && actualDiskMeta->queryTypeInfo()->canSerialize() &&
                           projectedDiskMeta->queryTypeInfo()->canInterpret() && projectedDiskMeta->queryTypeInfo()->canSerialize();


    /*
     * If a file part can be accessed local, then read it locally
     * If a file part supports a remote stream, then use that
     * Otherwise failover to the legacy remote access.
     */
    const char * format = helper.queryFormat();   // more - should extract from the current file (could even mix flat and csv...)
    Owned<IException> saveOpenExc;
    StringBuffer filename, filenamelist;
    std::vector<unsigned> remoteCandidates;

    // scan for local part 1st
    //MORE: Order of copies should be optimized at this point....
    unsigned numCopies = filePart?filePart->numCopies():ldFile->numPartCopies(partNum);
    for (unsigned copy=0; copy<numCopies; copy++)
    {
        RemoteFilename rfn;
        getFilename(rfn, filePart, localFile, partNum, copy);
        if (!isRemoteReadCandidate(agent, rfn))
        {
            StringBuffer path;
            rfn.getPath(path);
            IDiskRowReader * reader = ensureRowReader(format, false, expectedCrc, *expectedDiskMeta, projectedCrc, *projectedDiskMeta, actualCrc, *actualDiskMeta, fileInfo->meta);
            if (reader->setInputFile(path.str(), logicalFileName, whichPart, offsetOfPart, fileInfo->meta, fieldFilters))
            {
                initStream(reader, path.str());
                return true;
            }
        }
        else
            remoteCandidates.push_back(copy);
    }

    //First try remote streaming, and if that does not succeed, fall back to remote reading.
    bool allowFallbackToNonStreaming = false;
    for (;;)
    {
        for (unsigned copy: remoteCandidates)
        {
            RemoteFilename rfilename;
            getFilename(rfilename, filePart, localFile, partNum, copy);
            rfilename.getPath(filename.clear());
            filenamelist.append('\n').append(filename);
            try
            {
                IDiskRowReader * reader = ensureRowReader(format, tryRemoteStream, expectedCrc, *expectedDiskMeta, projectedCrc, *projectedDiskMeta, actualCrc, *actualDiskMeta, fileInfo->meta);
                if (reader->setInputFile(rfilename, logicalFileName, whichPart, offsetOfPart, fileInfo->meta, fieldFilters))
                {
                    initStream(reader, filename);
                    return true;
                }
            }
            catch (IException *E)
            {
                saveOrRelease(saveOpenExc, E);
            }
        }

        if (!tryRemoteStream || !allowFallbackToNonStreaming)
            break;
        tryRemoteStream = false;
    }

    if (!(helper.getFlags() & TDRoptional))
    {
        StringBuffer s;
        if (filenamelist)
        {
            if (saveOpenExc.get())
            {
                if (strstr(mangledHelperFileName.str(),"::>")!=NULL) // if a 'special' filename just use saved exception
                    saveOpenExc->errorMessage(s);
                else
                {
                    s.append("Could not open logical file ").append(mangledHelperFileName.str()).append(" in any of these locations:").append(filenamelist).append(" (");
                    saveOpenExc->errorMessage(s).append(")");
                }
            }
            else
                s.append("Could not open logical file ").append(mangledHelperFileName.str()).append(" in any of these locations:").append(filenamelist).append(" (").append((unsigned)GetLastError()).append(")");
        }
        else
            s.append("Could not open local physical file ").append(filename).append(" (").append((unsigned)GetLastError()).append(")");
        agent.fail(1, s.str());
    }

    return false;
}



bool CHThorNewDiskReadBaseActivity::openNext()
{
    return openNextPart(false);
}

void CHThorNewDiskReadBaseActivity::open()
{
    assertex(!opened);
    opened = true;
    if (!segHelper.canMatchAny())
    {
        setEmptyStream();
    }
    else
    {
        if (!openFirstPart())
            setEmptyStream();
    }
}

void CHThorNewDiskReadBaseActivity::verifyRecordFormatCrc()
{
    //MORE: Need to configure based on csv/xml
    ::verifyFormatCrcSuper(helper.getDiskFormatCrc(), ldFile?ldFile->queryDistributedFile():NULL, false, true);
}

void CHThorNewDiskReadBaseActivity::append(FFoption option, const IFieldFilter * filter)
{
    if (filter->isWild())
        filter->Release();
    else
        fieldFilters.append(*filter);
}

//=====================================================================================================

CHThorNewDiskReadActivity::CHThorNewDiskReadActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorNewDiskReadArg &_arg, ThorActivityKind _kind, EclGraph & _graph, IPropertyTree *_node)
: CHThorNewDiskReadBaseActivity(_agent, _activityId, _subgraphId, _arg, _arg, _kind, _node, _graph), helper(_arg), outBuilder(NULL)
{
    needTransform = false;
    lastGroupProcessed = 0;
    hasMatchFilter = helper.hasMatchFilter();
    useRawStream = hasMatchFilter || helper.needTransform();
}

void CHThorNewDiskReadActivity::ready()
{
    PARENT::ready();
    outBuilder.setAllocator(rowAllocator);
    lastGroupProcessed = processed;
    needTransform = helper.needTransform() || fieldFilters.length();
    limit = helper.getRowLimit();
    if (helper.getFlags() & TDRlimitskips)
        limit = (unsigned __int64) -1;
    stopAfter = helper.getChooseNLimit();
    if (!helper.transformMayFilter() && !helper.hasMatchFilter())
        remoteLimit = stopAfter;
    finishedParts = false;
}


void CHThorNewDiskReadActivity::stop()
{
    outBuilder.clear();
    PARENT::stop();
}


void CHThorNewDiskReadActivity::onLimitExceeded()
{
    if ( agent.queryCodeContext()->queryDebugContext())
        agent.queryCodeContext()->queryDebugContext()->checkBreakpoint(DebugStateLimit, NULL, static_cast<IActivityBase *>(this));
    helper.onLimitExceeded();
}

const void *CHThorNewDiskReadActivity::nextRow()
{
    //Avoid this check on each row- e.g., initialising streams with a null stream, which returns eof, and falls through to eof processing
    if (!opened) open();

    // Only check once per row returned.  Potentially means that heavily filtered datasets may wait a long time to check for abort
    queryUpdateProgress();

    //Avoid this test...  Combine the limit checking with choosen, and have choosen/limit triggering set the
    //stream to a special no more rows stream so that subsequent calls do not read records.
    if ((processed - initialProcessed) >= stopAfter)
        return nullptr;

    try
    {
        if (useRawStream)
        {
            for (;;)
            {
                //Returns a row in the serialized form of the projected format
                size32_t nextSize;
                const byte * next = (const byte *)inputRowStream->nextRow(nextSize);
                if (!isSpecialRow(next))
                {
                    if (likely(!hasMatchFilter || helper.canMatch(next)))
                    {
                        size32_t thisSize = helper.transform(outBuilder.ensureRow(), next);
                        if (thisSize != 0)
                        {
                            if (unlikely((processed - initialProcessed) >= limit))
                            {
                                outBuilder.clear();
                                onLimitExceeded();
                                return nullptr;
                            }
                            processed++;
                            return outBuilder.finalizeRowClear(thisSize);
                        }
                    }
                }
                else
                {
                    switch (getSpecialRowType(next))
                    {
                    case SpecialRow::eof:
                        if (!openNext())
                            return next; // i.e. eof
                        //rawStream will have changed, but it cannot change into a rowStream
                        break;
                    case SpecialRow::eos:
                        return next;
                    case SpecialRow::eog:
                        if (processed != lastGroupProcessed)
                        {
                            lastGroupProcessed = processed;
                            //MORE: Change to return next - i.e. an eog marker
                            return nullptr;
                        }
                        break;
                    default:
                        throwUnexpected();
                    }
                }
            }
        }
        else
        {
            //This branch avoids a memcpy from actual to projected followed by a deserialize - since it can map directly
            //May be more efficient to use this branch if serialized==deserialized and there is a filter, but no transform.
            //It would be possibel to have two (or more) different implementations, which were created based on
            //whether there was a limit, a transform etc., but unlikely to save more than a couple of boolean tests.
            for (;;)
            {
                const byte * next = (const byte *)inputRowStream->nextRow();
                if (!isSpecialRow(next))
                {
                    if (unlikely((processed - initialProcessed) >= limit))
                    {
                        ReleaseRoxieRow(next);
                        onLimitExceeded();
                        return nullptr;
                    }
                    processed++;
                    return next;
                }
                else
                {
                    switch (getSpecialRowType(next))
                    {
                    case SpecialRow::eof:
                        if (!openNext())
                            return next;
                        //rowStream will have changed
                        break;
                    case SpecialRow::eos:
                        return next;
                    case SpecialRow::eog:
                        if (processed != lastGroupProcessed)
                        {
                            lastGroupProcessed = processed;
                            return nullptr;
                        }
                        break;
                    default:
                        throwUnexpected();
                    }
                }
            }
        }
    }
    catch(IException * e)
    {
        throw makeWrappedException(e);
    }
    return NULL;
}

//=====================================================================================================

bool RemoteReadChecker::onlyReadLocally(const CLogicalFileSlice & slice, unsigned copy)
{
    //Allow all operations to be forced to be executed locally.
    if (forceRemoteDisabled.getValue(false))
        return true;

    //If not locally attached then there is no benefit in reading remotely
    if (!slice.onAttachedStorage(copy))
        return true;

    //If the file is not local then execute it remotely
    if (!slice.isLocal(copy))
        return false;

    StringBuffer localPath;
    slice.getURL(localPath, copy);
    if (forceRemoteRead.getValue(testForceRemote(localPath)))
        return false;
    return true;
}


CHThorGenericDiskReadBaseActivity::CHThorGenericDiskReadBaseActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorNewDiskReadBaseArg &_arg, IHThorCompoundBaseArg & _segHelper, ThorActivityKind _kind, EclGraph & _graph, IPropertyTree *_node)
: CHThorActivityBase(_agent, _activityId, _subgraphId, _arg, _kind, _graph), helper(_arg), segHelper(_segHelper), remoteReadChecker(_agent.queryWorkUnit())
{
    helper.setCallback(this);
    expectedDiskMeta = helper.queryDiskRecordSize();
    projectedDiskMeta = helper.queryProjectedDiskRecordSize();
    isCodeSigned = false;
    if (_node)
    {
        const char *recordTranslationModeHintText = _node->queryProp("hint[@name='layouttranslation']/@value");
        if (recordTranslationModeHintText)
            recordTranslationModeHint = getTranslationMode(recordTranslationModeHintText, true);
        isCodeSigned = isActivityCodeSigned(*_node);
    }

    grouped = ((helper.getFlags() & TDXgrouped) != 0);
    inputOptions.setown(createPTree());
    inputOptions->setPropBool("@grouped", grouped);
    inputOptions->setPropBool("@forceCompressed", (helper.getFlags() & TDXcompress) != 0);
    if (helper.getFlags() & TDRoptional)
        inputOptions->setPropBool("@optional", true);
    if ((helper.getFlags() & TDRcloneappendvirtual) != 0)
        inputOptions->setPropBool("@cloneAppendVirtuals", true);

    CPropertyTreeWriter writer(ensurePTree(inputOptions, "formatOptions"));
    helper.getFormatOptions(writer);

    outputGrouped = helper.queryOutputMeta()->isGrouped();  // It is possible for input to be incorrectly marked as grouped, and input not or vice-versa
    bool isTemporary = (helper.getFlags() & (TDXtemporary | TDXjobtemp)) != 0;
    files.init(this, agent.queryWuid(), isTemporary, agent.queryResolveFilesLocally(), isCodeSigned, agent.queryCodeContext()->queryUserDescriptor(), expectedDiskMeta);
    if (isTemporary)
    {
        StringBuffer spillPath;
        agent.getTempfileBase(spillPath);

        //Should probably be in eclagent
        spillPlane.setown(createPTree("planes"));
        spillPlane->setProp("@name", "localspill");
        spillPlane->setProp("@prefix", spillPath);
    }
}

CHThorGenericDiskReadBaseActivity::~CHThorGenericDiskReadBaseActivity()
{
    close();
}

void CHThorGenericDiskReadBaseActivity::ready()
{
    CHThorActivityBase::ready();

    opened = false;
    curSlice = NotFound;

    resolveFile();

    fieldFilters.kill();
    segHelper.createSegmentMonitors(this);
}

void CHThorGenericDiskReadBaseActivity::stop()
{
    close();
    CHThorActivityBase::stop();
}

unsigned __int64 CHThorGenericDiskReadBaseActivity::getFilePosition(const void * row)
{
    //These functions do not need to be implemented - they will be implemented by the translation layer
    throwUnexpected();
}

unsigned __int64 CHThorGenericDiskReadBaseActivity::getLocalFilePosition(const void * row)
{
    throwUnexpected();
}

void CHThorGenericDiskReadBaseActivity::noteException(unsigned severity, unsigned code, const char * text)
{
    //MORE: This should really supply the activity and the scope - a general issue for hthor errors...
    agent.addWuExceptionEx(text, code, severity, MSGAUD_user, "hthor");
}


const char * CHThorGenericDiskReadBaseActivity::queryLogicalFilename(const void * row)
{
    throwUnexpected();
}

void CHThorGenericDiskReadBaseActivity::resolveFile()
{
    //If in a child query, and the filenames haven't changed, the information about the resolved filenames will also not have changed
    //Assume that is also true for format properties - require dynamic if they are to be recalculated.
    if (resolved && !(helper.getFlags() & (TDXvarfilename|TDRdynformatoptions)))
        return;
    resolved = true;

    //Update the inputOptions and formatOptions if they depend on the current context
    curInputOptions.set(inputOptions);
    //Check for encryption key
    void *k;
    size32_t kl;
    helper.getEncryptKey(kl,k);
    if (kl || (helper.getFlags() & TDRdynformatoptions))
    {
        curInputOptions.setown(createPTreeFromIPT(inputOptions));
        if (kl)
        {
            curInputOptions->setPropBin("encryptionKey", kl, k);
            curInputOptions->setPropBool("blockcompressed", true);
            curInputOptions->setPropBool("compressed", true);
        }

        if (helper.getFlags() & TDRdynformatoptions)
        {
            Owned<IPropertyTree> helperFormatOptions = createPTree("formatOptions");
            CPropertyTreeWriter writer(helperFormatOptions);
            helper.getFormatDynOptions(writer);

            IPropertyTree * curFormatOptions = ensurePTree(curInputOptions, "formatOptions");
            mergeConfiguration(*curFormatOptions, *helperFormatOptions, nullptr, true);
        }
    }

    //Extract meta information from the helper.  Another (possibly more efficient) alternative to an IPropertyTree would be a class.
    bool isTemporary = (helper.getFlags() & (TDXtemporary | TDXjobtemp)) != 0;
    OwnedRoxieString fileName(helper.getFileName());
    if (isTemporary)
    {
        StringBuffer mangledFilename;
        mangleLocalTempFilename(mangledFilename, fileName, agent.queryWuid());    // should this occur inside setEclFilename?
        curInputOptions->setPropBool("@singlePartNoSuffix", true);
        files.setTempFilename(mangledFilename, curInputOptions, spillPlane);
    }
    else
    {
        StringBuffer lfn;
        expandLogicalFilename(lfn, fileName, agent.queryWorkUnit(), false, false);
        files.setEclFilename(lfn, curInputOptions);
    }
    slices.clear();
    files.calcPartition(slices, 1, 0, false, true);
    curSlice = 0;
}

void CHThorGenericDiskReadBaseActivity::close()
{
    closepart();
    if (activeSlice)
        activeSlice->setAccessed();
}

void CHThorGenericDiskReadBaseActivity::closepart()
{
    if (activeReader)
    {
        activeReader->clearInput();
        activeReader = nullptr;
        activeSlice = nullptr;
    }
}

bool CHThorGenericDiskReadBaseActivity::openFirstPart()
{
    if (openFilePart(0U))
        return true;
    setEmptyStream();
    return false;
}

bool CHThorGenericDiskReadBaseActivity::openNextPart()
{
    if (curSlice == NotFound)
        return false;

    if (activeSlice)
        closepart();

    if (openFilePart(curSlice+1))
        return true;
    setEmptyStream();
    return false;
}

void CHThorGenericDiskReadBaseActivity::initStream(CLogicalFileSlice * slice, IDiskRowReader * reader)
{
    activeSlice = slice;
    activeReader = reader;
    inputRowStream = reader->queryAllocatedRowStream(rowAllocator);

    StringBuffer report("Reading file ");
    activeSlice->getTracingFilename(report);
    agent.reportProgress(report.str());
}

void CHThorGenericDiskReadBaseActivity::setEmptyStream()
{
    inputRowStream = queryNullDiskRowStream();
    finishedParts = true;
}

IDiskRowReader * CHThorGenericDiskReadBaseActivity::ensureRowReader(const char * format, bool streamRemote, unsigned expectedCrc, IOutputMetaData & expected, unsigned projectedCrc, IOutputMetaData & projected, unsigned actualCrc, IOutputMetaData & actual, CLogicalFileSlice * slice)
{
    bool translateFromActual = strsame(format, slice->queryFormat());
    //Backwards compatibility - there should be an option to override this
    if (strsame(format, "csv") || strsame(format, "xml"))
        translateFromActual = false;

    //If the actual and expected file formats do not translate from the actual file format - use the expected format instead
    Owned<IDiskReadMapping> mapping;
    if (translateFromActual)
        mapping.setown(createDiskReadMapping(getLayoutTranslationMode(), format, actualCrc, actual, expectedCrc, expected, projectedCrc, projected, slice->queryFileMeta()));
    else
        mapping.setown(createDiskReadMapping(getLayoutTranslationMode(), format, expectedCrc, expected, expectedCrc, expected, projectedCrc, projected, slice->queryFileMeta()));

    ForEachItemIn(i, readers)
    {
        IDiskRowReader & cur = readers.item(i);
        if (cur.matches(format, streamRemote, mapping))
            return &cur;
    }
    IDiskRowReader * reader = createDiskReader(format, streamRemote, mapping);
    readers.append(*reader);
    return reader;
}

bool CHThorGenericDiskReadBaseActivity::openFilePart(unsigned whichSlice)
{
    for (;;)
    {
        if (whichSlice >= slices.size())
        {
            curSlice = NotFound;
            return false;
        }

        if (openFilePart(&slices[whichSlice]))
        {
            curSlice = whichSlice;
            activeSlice = &slices[whichSlice];
            return true;
        }

        whichSlice++;
    }
}

bool CHThorGenericDiskReadBaseActivity::openFilePart(CLogicalFileSlice * nextSlice)
{
    unsigned expectedCrc = helper.getDiskFormatCrc();
    unsigned projectedCrc = helper.getProjectedFormatCrc();
    unsigned actualCrc = nextSlice->queryFile()->queryActualCrc();
    IOutputMetaData * actualDiskMeta = nextSlice->queryFile()->queryActualMeta();

    bool tryRemoteStream = actualDiskMeta->queryTypeInfo()->canInterpret() && actualDiskMeta->queryTypeInfo()->canSerialize() &&
                           projectedDiskMeta->queryTypeInfo()->canInterpret() && projectedDiskMeta->queryTypeInfo()->canSerialize();


    /*
     * If a file part can be accessed local, then read it locally
     * If a file part supports a remote stream, then use that
     * Otherwise failover to the legacy remote access.
     */
    const char * format = helper.queryFormat();
    // If format is not specified in the ECL then it is deduced from the file.  It must be the same for all copies of a file part
    if (!format)
        format = nextSlice->queryFormat();

    Owned<IException> saveOpenExc;
    StringBuffer filenamelist;
    std::vector<unsigned> remoteCandidates;

    // scan for local part 1st
    //MORE: Order of copies should be optimized at this point....
    unsigned numCopies = nextSlice->getNumCopies();
    for (unsigned copy=0; copy<numCopies; copy++)
    {
        if (remoteReadChecker.onlyReadLocally(*nextSlice, copy))
        {
            IDiskRowReader * reader = ensureRowReader(format, false, expectedCrc, *expectedDiskMeta, projectedCrc, *projectedDiskMeta, actualCrc, *actualDiskMeta, nextSlice);
            if (reader->setInputFile(*nextSlice, fieldFilters, copy))
            {
                initStream(nextSlice, reader);
                return true;
            }
        }
        else
            remoteCandidates.push_back(copy);
    }

    //First try remote streaming, and if that does not succeed, fall back to remote reading.
    bool allowFallbackToNonStreaming = true;
    for (;;)
    {
        for (unsigned copy: remoteCandidates)
        {
            StringBuffer filename;
            nextSlice->getURL(filename, copy);
            filenamelist.append('\n').append(filename);
            try
            {
                IDiskRowReader * reader = ensureRowReader(format, tryRemoteStream, expectedCrc, *expectedDiskMeta, projectedCrc, *projectedDiskMeta, actualCrc, *actualDiskMeta, nextSlice);
                if (reader->setInputFile(*nextSlice, fieldFilters, copy))
                {
                    initStream(nextSlice, reader);
                    return true;
                }
            }
            catch (IException *E)
            {
                saveOrRelease(saveOpenExc, E);
            }
        }

        if (!tryRemoteStream || !allowFallbackToNonStreaming)
            break;
        tryRemoteStream = false;
    }

    if (!(helper.getFlags() & TDRoptional))
    {
        //Should this be unconditional?  If the logical file exists, but the file can't be opened, it isn't really what OPT means.
        StringBuffer s;
        StringBuffer tracingName;
        nextSlice->getTracingFilename(tracingName);

        if (filenamelist)
        {
            if (saveOpenExc.get())
            {
                if (!nextSlice->isLogicalFile())
                    saveOpenExc->errorMessage(s);
                else
                {
                    s.append("Could not open logical file ").append(tracingName).append(" in any of these locations:").append(filenamelist).append(" (");
                    saveOpenExc->errorMessage(s).append(")");
                }
            }
            else
                s.append("Could not open logical file ").append(tracingName).append(" in any of these locations:").append(filenamelist).append(" (").append((unsigned)GetLastError()).append(")");
        }
        else
        {
            const char * filename = nextSlice->queryFile()->queryLogicalFilename();
            s.append("Could not open local physical file ").append(filename).append(" (").append((unsigned)GetLastError()).append(")");
        }
        agent.fail(1, s.str());
    }
    return false;
}


bool CHThorGenericDiskReadBaseActivity::openNext()
{
    return openNextPart();
}

void CHThorGenericDiskReadBaseActivity::open()
{
    assertex(!opened);
    opened = true;
    if (!segHelper.canMatchAny())
    {
        setEmptyStream();
    }
    else
    {
        if (!openFirstPart())
            setEmptyStream();
    }
}

void CHThorGenericDiskReadBaseActivity::append(FFoption option, const IFieldFilter * filter)
{
    if (filter->isWild())
        filter->Release();
    else
        fieldFilters.append(*filter);
}

//=====================================================================================================

CHThorGenericDiskReadActivity::CHThorGenericDiskReadActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorNewDiskReadArg &_arg, ThorActivityKind _kind, EclGraph & _graph, IPropertyTree *_node)
: CHThorGenericDiskReadBaseActivity(_agent, _activityId, _subgraphId, _arg, _arg, _kind, _graph, _node), helper(_arg), outBuilder(NULL)
{
    hasMatchFilter = helper.hasMatchFilter();
    useRawStream = hasMatchFilter || helper.needTransform();
}

void CHThorGenericDiskReadActivity::ready()
{
    PARENT::ready();
    outBuilder.setAllocator(rowAllocator);
    lastGroupProcessed = processed;
    needTransform = helper.needTransform() || fieldFilters.length();
    limit = helper.getRowLimit();
    if (helper.getFlags() & TDRlimitskips)
        limit = (unsigned __int64) -1;
    stopAfter = helper.getChooseNLimit();
    if (!helper.transformMayFilter() && !helper.hasMatchFilter())
        remoteLimit = stopAfter;
    finishedParts = false;
}


void CHThorGenericDiskReadActivity::stop()
{
    outBuilder.clear();
    PARENT::stop();
}


void CHThorGenericDiskReadActivity::onLimitExceeded()
{
    if ( agent.queryCodeContext()->queryDebugContext())
        agent.queryCodeContext()->queryDebugContext()->checkBreakpoint(DebugStateLimit, NULL, static_cast<IActivityBase *>(this));
    helper.onLimitExceeded();
}

const void *CHThorGenericDiskReadActivity::nextRow()
{
    //Avoid this check on each row- e.g., initialising streams with a null stream, which returns eof, and falls through to eof processing
    if (!opened) open();

    // Only check once per row returned.  Potentially means that heavily filtered datasets may wait a long time to check for abort
    queryUpdateProgress();

    //Avoid this test...  Combine the limit checking with choosen, and have choosen/limit triggering set the
    //stream to a special no more rows stream so that subsequent calls do not read records.
    if ((processed - initialProcessed) >= stopAfter)
        return nullptr;

    try
    {
        if (useRawStream)
        {
            for (;;)
            {
                //Returns a row in the serialized form of the projected format
                size32_t nextSize;
                const byte * next = (const byte *)inputRowStream->nextRow(nextSize);
                if (!isSpecialRow(next))
                {
                    if (likely(!hasMatchFilter || helper.canMatch(next)))
                    {
                        size32_t thisSize = helper.transform(outBuilder.ensureRow(), next);
                        if (thisSize != 0)
                        {
                            if (unlikely((processed - initialProcessed) >= limit))
                            {
                                outBuilder.clear();
                                onLimitExceeded();
                                return nullptr;
                            }
                            processed++;
                            return outBuilder.finalizeRowClear(thisSize);
                        }
                    }
                }
                else
                {
                    switch (getSpecialRowType(next))
                    {
                    case SpecialRow::eof:
                        if (!openNext())
                            return next; // i.e. eof
                        //rawStream will have changed, but it cannot change into a rowStream
                        break;
                    case SpecialRow::eos:
                        return next;
                    case SpecialRow::eog:
                        if (outputGrouped && (processed != lastGroupProcessed))
                        {
                            lastGroupProcessed = processed;
                            //MORE: Change to return next - i.e. an eog marker
                            return nullptr;
                        }
                        break;
                    default:
                        throwUnexpected();
                    }
                }
            }
        }
        else
        {
            //This branch avoids a memcpy from actual to projected followed by a deserialize - since it can map directly
            //May be more efficient to use this branch if serialized==deserialized and there is a filter, but no transform.
            //It would be possibel to have two (or more) different implementations, which were created based on
            //whether there was a limit, a transform etc., but unlikely to save more than a couple of boolean tests.
            for (;;)
            {
                const byte * next = (const byte *)inputRowStream->nextRow();
                if (!isSpecialRow(next))
                {
                    if (unlikely((processed - initialProcessed) >= limit))
                    {
                        ReleaseRoxieRow(next);
                        onLimitExceeded();
                        return nullptr;
                    }
                    processed++;
                    return next;
                }
                else
                {
                    switch (getSpecialRowType(next))
                    {
                    case SpecialRow::eof:
                        if (!openNext())
                            return next;
                        //rowStream will have changed
                        break;
                    case SpecialRow::eos:
                        return next;
                    case SpecialRow::eog:
                        if (processed != lastGroupProcessed)
                        {
                            lastGroupProcessed = processed;
                            return nullptr;
                        }
                        break;
                    default:
                        throwUnexpected();
                    }
                }
            }
        }
    }
    catch(IException * e)
    {
        throw makeWrappedException(e);
    }
    return NULL;
}

//=====================================================================================================

MAKEFACTORY(DiskWrite);
MAKEFACTORY(Iterate);
MAKEFACTORY(Filter);
MAKEFACTORY(Aggregate);
MAKEFACTORY(Rollup);
MAKEFACTORY(Project);
MAKEFACTORY(PrefetchProject);
MAKEFACTORY(FilterProject);

extern HTHOR_API IHThorActivity * createGroupDedupActivity(IAgentContext & _agent, unsigned _activityId, unsigned _subgraphId, IHThorDedupArg & arg, ThorActivityKind kind, EclGraph & _graph)
{
    if(arg.compareAll())
        return new CHThorGroupDedupAllActivity(_agent, _activityId, _subgraphId, arg, kind, _graph);
    else if (arg.keepLeft() && !arg.keepBest())
        return new CHThorGroupDedupKeepLeftActivity(_agent, _activityId, _subgraphId, arg, kind, _graph);
    else
        return new CHThorGroupDedupKeepRightActivity(_agent, _activityId, _subgraphId, arg, kind, _graph);
}

MAKEFACTORY(HashDedup);
MAKEFACTORY(Group);
MAKEFACTORY(Degroup);
MAKEFACTORY_ARG(GroupSort, Sort);
MAKEFACTORY(Join);
MAKEFACTORY_ARG(SelfJoin, Join);
MAKEFACTORY_ARG(LookupJoin, HashJoin);
MAKEFACTORY(AllJoin);
MAKEFACTORY(WorkUnitWrite);
MAKEFACTORY(DictionaryWorkUnitWrite);
MAKEFACTORY(FirstN);
MAKEFACTORY(InlineTable);
MAKEFACTORY_ARG(Concat, Funnel);
MAKEFACTORY(Apply);
MAKEFACTORY(Sample);
MAKEFACTORY(Normalize);
MAKEFACTORY(NormalizeChild);
MAKEFACTORY(NormalizeLinkedChild);
MAKEFACTORY(Distribution);
MAKEFACTORY(RemoteResult);
MAKEFACTORY(ChooseSets);
MAKEFACTORY_ARG(ChooseSetsLast, ChooseSetsEx);
MAKEFACTORY_ARG(ChooseSetsEnth, ChooseSetsEx);
MAKEFACTORY(WorkunitRead);
MAKEFACTORY(PipeRead);
MAKEFACTORY(PipeWrite);
MAKEFACTORY(CsvWrite);
MAKEFACTORY(XmlWrite);
MAKEFACTORY(PipeThrough);
MAKEFACTORY(If);

extern HTHOR_API IHThorActivity *createChildIfActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorIfArg &arg, ThorActivityKind kind, EclGraph & _graph)
{
    return new CHThorIfActivity(_agent, _activityId, _subgraphId, arg, kind, _graph);
}

extern HTHOR_API IHThorActivity *createHashAggregateActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorHashAggregateArg &arg, ThorActivityKind kind, EclGraph & _graph, bool _isGroupedAggregate)
{
    return new CHThorHashAggregateActivity(_agent, _activityId, _subgraphId, arg, kind, _graph, _isGroupedAggregate);
}

extern HTHOR_API IHThorActivity *createGenericDiskReadActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorNewDiskReadArg &arg, ThorActivityKind kind, EclGraph & _graph, IPropertyTree * node)
{
    return new CHThorGenericDiskReadActivity(_agent, _activityId, _subgraphId, arg, kind, _graph, node);
}

MAKEFACTORY(Null);
MAKEFACTORY(SideEffect);
MAKEFACTORY(Action);
MAKEFACTORY(SelectN);
MAKEFACTORY(Spill);
MAKEFACTORY(Limit);
MAKEFACTORY_ARG(SkipLimit, Limit);
MAKEFACTORY_ARG(OnFailLimit, Limit);
MAKEFACTORY(Catch);
MAKEFACTORY_ARG(SkipCatch, Catch);
MAKEFACTORY(CountProject);
MAKEFACTORY(IndexWrite);
MAKEFACTORY(Parse);
MAKEFACTORY(Enth);
MAKEFACTORY(TopN);
MAKEFACTORY(XmlParse);
MAKEFACTORY(Merge);
MAKEFACTORY_ARG(HttpRowCall, HttpCall);
MAKEFACTORY_ARG(SoapRowCall, SoapCall);
MAKEFACTORY_ARG(SoapRowAction, SoapAction);
MAKEFACTORY_ARG(SoapDatasetCall, SoapCall);
MAKEFACTORY_ARG(SoapDatasetAction, SoapAction);
MAKEFACTORY(DatasetResult);
MAKEFACTORY(RowResult);
MAKEFACTORY(ChildIterator);

extern HTHOR_API IHThorActivity *createDummyActivity(IAgentContext &_agent, unsigned _activityId, unsigned _subgraphId, IHThorArg &arg, ThorActivityKind kind, EclGraph & _graph)
{
    return new CHThorDummyActivity(_agent, _activityId, _subgraphId, arg, kind, _graph);
}

MAKEFACTORY_EXTRA(WhenAction,EclGraphElement *)
MAKEFACTORY_EXTRA(LibraryCall, IPropertyTree *)
MAKEFACTORY(ChildNormalize)
MAKEFACTORY(ChildAggregate)
MAKEFACTORY(ChildGroupAggregate)
MAKEFACTORY(ChildThroughNormalize)

MAKEFACTORY_EXTRA(DiskRead, IPropertyTree *)
MAKEFACTORY_EXTRA(DiskNormalize, IPropertyTree *)
MAKEFACTORY_EXTRA(DiskAggregate, IPropertyTree *)
MAKEFACTORY_EXTRA(DiskCount, IPropertyTree *)
MAKEFACTORY_EXTRA(DiskGroupAggregate, IPropertyTree *)
MAKEFACTORY_EXTRA(CsvRead, IPropertyTree *)
MAKEFACTORY_EXTRA(XmlRead, IPropertyTree *)

MAKEFACTORY_EXTRA(NewDiskRead, IPropertyTree *)

MAKEFACTORY_EXTRA(LocalResultRead, __int64)
MAKEFACTORY_EXTRA(LocalResultWrite, __int64)
MAKEFACTORY_EXTRA(DictionaryResultWrite, __int64)
MAKEFACTORY_EXTRA(LocalResultSpill, __int64)
MAKEFACTORY_EXTRA(GraphLoopResultRead, __int64)
MAKEFACTORY_EXTRA(GraphLoopResultWrite, __int64)
MAKEFACTORY_EXTRA(NWayGraphLoopResultRead, __int64)

MAKEFACTORY(Combine)
MAKEFACTORY(RollupGroup)
MAKEFACTORY(Regroup)
MAKEFACTORY(CombineGroup)
MAKEFACTORY(Case)
MAKEFACTORY(LinkedRawIterator)
MAKEFACTORY(GraphLoop)
MAKEFACTORY(Loop)
MAKEFACTORY(Process)
MAKEFACTORY(Grouped)
MAKEFACTORY(Sorted)
MAKEFACTORY(Trace)
MAKEFACTORY(NWayInput)
MAKEFACTORY(NWaySelect)
MAKEFACTORY(NonEmpty)
MAKEFACTORY(FilterGroup);
MAKEFACTORY(StreamedIterator);
MAKEFACTORY_EXTRA(External, IPropertyTree *);

IHThorException * makeHThorException(ThorActivityKind kind, unsigned activityId, unsigned subgraphId, int code, char const * format, ...)
{
    va_list args;
    va_start(args, format);
    IHThorException * ret = new CHThorException(code, format, args, MSGAUD_user, kind, activityId, subgraphId);
    va_end(args);
    return ret;
}

IHThorException * makeHThorException(ThorActivityKind kind, unsigned activityId, unsigned subgraphId, IException * exc)
{
    return new CHThorException(exc, kind, activityId, subgraphId);
}

IHThorException * makeHThorException(ThorActivityKind kind, unsigned activityId, unsigned subgraphId, IException * exc, char const * extra)
{
    return new CHThorException(exc, extra, kind, activityId, subgraphId);
}