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Posted to issues@spark.apache.org by "Sean R. Owen (Jira)" <ji...@apache.org> on 2021/12/14 13:32:00 UTC

[jira] [Resolved] (SPARK-37567) reuse Exchange failed

     [ https://issues.apache.org/jira/browse/SPARK-37567?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sean R. Owen resolved SPARK-37567.
----------------------------------
    Resolution: Not A Problem

> reuse Exchange failed 
> ----------------------
>
>                 Key: SPARK-37567
>                 URL: https://issues.apache.org/jira/browse/SPARK-37567
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 3.1.1
>            Reporter: junbiao chen
>            Priority: Major
>              Labels: bugfix, performance, pull-request-available
>         Attachments: execution stage(1)-query2.png, execution stage-query2.png, physical plan-query2.png
>
>
> PR available：https://github.com/apache/spark/pull/34858
> use case：query2 in TPC-DS.There are three exchange subquery will scan the same table "store_sales" in logical plan,these subqueries meet exchange reuse rule.I confirm that the exchange use rule  work in physical plan.But when spark execute the physical plan,I find out 
> exchange reuse failed,reused exchange has been executed twice.
> physical plan：
> !physical plan-query2.png!
>  
> execution stages：
> !execution stage-query2.png!
>  
> !execution stage(1)-query2.png!



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