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Posted to dev@hive.apache.org by "Deepak Jaiswal (JIRA)" <ji...@apache.org> on 2017/10/30 18:31:00 UTC

[jira] [Created] (HIVE-17936) Dynamic Semijoin Reduction : markSemiJoinForDPP marks unwanted semijoin branches

Deepak Jaiswal created HIVE-17936:
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             Summary: Dynamic Semijoin Reduction : markSemiJoinForDPP marks unwanted semijoin branches
                 Key: HIVE-17936
                 URL: https://issues.apache.org/jira/browse/HIVE-17936
             Project: Hive
          Issue Type: Bug
            Reporter: Deepak Jaiswal
            Assignee: Deepak Jaiswal


In method markSemiJoinForDPP (HIVE-17399), the nDVs comparison should not have equality as there is a chance that the values are same on both sides and the branch is still marked as good when it shouldn't be.
Add a configurable factor to see how useful this is if nDVs on smaller side are only slightly less than that on TS side.



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