HPCC-14812 Fix ROWDIFF with nested records

Signed-off-by: Gavin Halliday <gavin.halliday@lexisnexis.com>

ecl/hqlcpp/hqlhtcpp.cpp

@@ -8023,7 +8023,7 @@ void HqlCppTranslator::doBuildExprSizeof(BuildCtx & ctx, IHqlExpression * expr,
 
 }
 
-void HqlCppTranslator::doBuildExprRowDiff(BuildCtx & ctx, const CHqlBoundTarget & target, IHqlExpression * expr, IHqlExpression * rightRecord, IHqlExpression * leftSelector, IHqlExpression * rightSelector, StringBuffer & selectorText, bool isCount)
+void HqlCppTranslator::doBuildExprRowDiff(BuildCtx & ctx, const CHqlBoundTarget & target, IHqlExpression * expr, IHqlExpression * leftSelector, IHqlExpression * rightRecord, IHqlExpression * rightSelector, StringBuffer & selectorText, bool isCount)
 {
     switch (expr->getOperator())
     {

ecl/regress/rowdiff.ecl

@@ -26,16 +26,18 @@ string20            middle;
                 end;
             end;
 
-
-in1rec :=   record
+idRec := record
 unsigned    id;
+END;
+
+in1rec :=   record(idRec)
 complexName name;
 unsigned    age;
 string      title;
         end;
 
 in2rec := record
-unsigned    id;
+idRec;
 complexName name;
 real8       age;
 boolean     dead;