Github user traflm commented on a diff in the pull request:
https://github.com/apache/incubator-trafodion/pull/623#discussion_r72797920
--- Diff: core/sql/optimizer/BindRelExpr.cpp ---
@@ -717,7 +717,7 @@ static ItemExpr *intersectColumns(const RETDesc
&leftTable,
ItemExpr *leftExpr = leftTable.getValueId(i).getItemExpr();
ItemExpr *rightExpr = rightTable.getValueId(i).getItemExpr();
BiRelat *compare = new (bindWA->wHeap())
- BiRelat(ITM_EQUAL, leftExpr, rightExpr);
+ BiRelat(ITM_EQUAL, leftExpr, rightExpr, TRUE);
--- End diff --
I use CQD nested_joins 'off'
and it generates a HASH JOIN plan, and the test still works for null value.
I don't know why, the plan for HASH_JOIN has an option 'u', not sure what does
that mean.
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at [email protected] or file a JIRA ticket
with INFRA.
---
