Deepak Jaiswal created HIVE-20393:
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Summary: Semijoin Reduction : markSemiJoinForDPP behaves
inconsistently
Key: HIVE-20393
URL: https://issues.apache.org/jira/browse/HIVE-20393
Project: Hive
Issue Type: Bug
Reporter: Deepak Jaiswal
Assignee: Deepak Jaiswal
markSemiJoinForDPP has multiple issues,
* Uses map tsOps which is wrong as it disallows going thru same TS which may
have filters from more than 1 semijoin edges. This results in inconsistent
plans for same query as semijoin edges may be processed in different order each
time.
* Uses getColumnExpr() which is not as robust as extractColumn() thus
resulting in NPEs.
* The logic to mark an edge useful when NPE is hit may end up having bad edge.
cc [~gopalv]
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