[jira] [Commented] (SPARK-39126) After eliminating join to one side, that side should take advantage of LocalShuffleRead optimization

["Apache Spark (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-39126?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17552697#comment-17552697 ] 

Apache Spark commented on SPARK-39126:
--------------------------------------

User 'mcdull-zhang' has created a pull request for this issue:
https://github.com/apache/spark/pull/36831

> After eliminating join to one side, that side should take advantage of LocalShuffleRead optimization
> ----------------------------------------------------------------------------------------------------
>
>                 Key: SPARK-39126
>                 URL: https://issues.apache.org/jira/browse/SPARK-39126
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 3.2.1
>            Reporter: mcdull_zhang
>            Assignee: Apache Spark
>            Priority: Minor
>
> PropagateEmptyRelation can simplify Join. For example, if the right side of LEFT JOIN is empty, then it can eliminate join to its left side.
> If there is a shuffle on the left side, it can be considered that the shuffle is meaningless, and the shuffle can be optimized by using LocalRead.



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