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Posted to issues@spark.apache.org by "junbiao chen (Jira)" <ji...@apache.org> on 2021/12/07 10:01:00 UTC
[jira] [Commented] (SPARK-37567) reuse Exchange failed
[ https://issues.apache.org/jira/browse/SPARK-37567?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17454524#comment-17454524 ]
junbiao chen commented on SPARK-37567:
--------------------------------------
Hi,[~davies], Is this a reuse bug?
> 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: performance
> Attachments: execution stage(1)-query2.png, execution stage-query2.png, physical plan-query2.png
>
>
> 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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