Github user traflm commented on a diff in the pull request:
https://github.com/apache/incubator-trafodion/pull/795#discussion_r85632431
--- Diff: core/sql/optimizer/RelGrby.h ---
@@ -552,7 +560,9 @@ class GroupByAgg : public RelExpr
// ---------------------------------------------------------------------
ItemExpr * groupExprTree_;
ValueIdSet groupExpr_;
-
+
+ ItemExpr * extraGrpOrderby_;
+ ValueIdSet extraOrderExpr_;
--- End diff --
You are right Suresh. I will change it into ValueIdList, and avoid the ugly
conversion in the OptPhysRelExpr.cpp
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