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https://issues.apache.org/jira/browse/HIVE-28490?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17893660#comment-17893660
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Seonggon Namgung commented on HIVE-28490:
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[~dkuzmenko] , you're right. We are discarding TS_3, and the slide is wrong.
The set of operators, \{SEL_140, GBY_141, RS_142, GBY_143, RS_144}, represents
discardableInputOps of TS_3. (The operators are ancestors of TS_3, not TS_41.)
I will update the slide. Thanks for pointing out it.
> SharedWorkOptimizer sometimes removes useful DPP sources.
> ---------------------------------------------------------
>
> Key: HIVE-28490
> URL: https://issues.apache.org/jira/browse/HIVE-28490
> Project: Hive
> Issue Type: Improvement
> Reporter: Seonggon Namgung
> Assignee: Seonggon Namgung
> Priority: Major
> Labels: pull-request-available
> Attachments: 3.StopRemovingRetainableDPP.1.pptx,
> 3.StopRemovingRetainableDPP.pptx
>
>
> Current SharedWorkOptimizer sometimes removes DPP sources that are not
> invalidated. I found that findAscendantWorkOperators() returns a super set of
> ascendant operators, which causes wrong DPP source removal.
> Please check out the attached slides for detailed explanation.
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