[jira] [Work logged] (HIVE-26968) SharedWorkOptimizer merges TableScan operators that have different DPP parents

Tue, 28 Mar 2023 05:28:33 -0700 


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https://issues.apache.org/jira/browse/HIVE-26968?focusedWorklogId=853395&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-853395
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ASF GitHub Bot logged work on HIVE-26968:
-----------------------------------------

                Author: ASF GitHub Bot
            Created on: 28/Mar/23 12:27
            Start Date: 28/Mar/23 12:27
    Worklog Time Spent: 10m 
      Work Description: sonarcloud[bot] commented on PR #3981:
URL: https://github.com/apache/hive/pull/3981#issuecomment-1486796427

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Issue Time Tracking
-------------------

    Worklog Id:     (was: 853395)
    Time Spent: 0.5h  (was: 20m)

> 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: 0.5h
>  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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