Github user traflm commented on a diff in the pull request:
https://github.com/apache/incubator-trafodion/pull/623#discussion_r72796626
--- 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 --
the showplan output is too long. not sure if you can see it correctly...
Here is simpler version of explain, it is a nest loop join.
>>explain options 'f' select eno, ename, dno from t021
intersect
+>+>select eno, ename, dno from t022;
LC RC OP OPERATOR OPT DESCRIPTION CARD
---- ---- ---- -------------------- -------- --------------------
---------
4 . 5 root
2.00E+000
2 3 4 nested_join
2.00E+000
. . 3 trafodion_vsbb_scan T021
1.00E+000
1 . 2 hash_groupby
2.00E+000
. . 1 trafodion_scan T022
2.50E+001
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