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https://issues.apache.org/jira/browse/HIVE-17936?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16239377#comment-16239377
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Lefty Leverenz commented on HIVE-17936:
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Doc note: This adds *hive.tez.dynamic.semijoin.reduction.for.dpp.factor* to
HiveConf.java, so it needs to be documented in the wiki.
* [Configuration Properties -- Tez |
https://cwiki.apache.org/confluence/display/Hive/Configuration+Properties#ConfigurationProperties-Tez]
Added a TODOC3.0 label.
> 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
> Labels: TODOC3.0
> Fix For: 3.0.0
>
> Attachments: HIVE-17936.1.patch, HIVE-17936.2.patch,
> HIVE-17936.3.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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