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https://issues.apache.org/jira/browse/HIVE-28490?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17899462#comment-17899462
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Denys Kuzmenko commented on HIVE-28490:
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Merged to master.
Thanks [~seonggon] for the patch!
> SharedWorkOptimizer sometimes removes useful DPP sources.
> ---------------------------------------------------------
>
> Key: HIVE-28490
> URL: https://issues.apache.org/jira/browse/HIVE-28490
> Project: Hive
> Issue Type: Improvement
> Components: Logical Optimizer
> Reporter: Seonggon Namgung
> Assignee: Seonggon Namgung
> Priority: Major
> Labels: hive-4.1.0-must, pull-request-available
> Attachments: 3.StopRemovingRetainableDPP.1.pdf
>
>
> 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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