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Posted to issues@hive.apache.org by "Seonggon Namgung (Jira)" <ji...@apache.org> on 2024/10/29 01:20:00 UTC

[jira] [Updated] (HIVE-28490) SharedWorkOptimizer sometimes removes useful DPP sources.

     [ https://issues.apache.org/jira/browse/HIVE-28490?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Seonggon Namgung updated HIVE-28490:
------------------------------------
    Attachment: 3.StopRemovingRetainableDPP.1.pptx

> 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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