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https://issues.apache.org/jira/browse/HIVE-26968?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17729279#comment-17729279
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Stamatis Zampetakis commented on HIVE-26968:
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[~seonggon] From some tests that I did locally it seems that the value of
hive.optimize.shared.work.dppunion is not important to reproduce the problem.
With the simplified test that I pushed in #3981 I get wrong results
consistently for both dppunion=true and dppunion=false.
> SharedWorkOptimizer merges TableScan operators that have different DPP parents
> ------------------------------------------------------------------------------
>
> Key: HIVE-26968
> URL: https://issues.apache.org/jira/browse/HIVE-26968
> Project: Hive
> Issue Type: Sub-task
> Affects Versions: 4.0.0-alpha-2
> Reporter: Seonggon Namgung
> Assignee: Seonggon Namgung
> Priority: Critical
> Labels: hive-4.0.0-must, pull-request-available
> Attachments: TPC-DS Query64 OperatorGraph.pdf
>
> Time Spent: 50m
> Remaining Estimate: 0h
>
> SharedWorkOptimizer merges TableScan operators that have different DPP
> parents, which leads to the creation of semantically wrong query plan.
> In our environment, running TPC-DS query64 on 1TB Iceberg format table
> returns no rows because of this problem. (The correct result has 7094 rows.)
> We use hive.optimize.shared.work=true,
> hive.optimize.shared.work.extended=true, and
> hive.optimize.shared.work.dppunion=false to reproduce the bug.
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