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

[Seonggon Namgung (Jira)]

Seonggon Namgung created HIVE-28490:
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             Summary: 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
         Attachments: 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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