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https://issues.apache.org/jira/browse/HIVE-17936?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Deepak Jaiswal updated HIVE-17936:
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Attachment: HIVE-17936.1.patch
Added the config and a test for it along with the fix.
> 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
> Attachments: HIVE-17936.1.patch
>
>
> 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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