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Posted to issues@spark.apache.org by "Apache Spark (Jira)" <ji...@apache.org> on 2022/05/09 04:03:00 UTC
[jira] [Assigned] (SPARK-39126) After eliminating join to one side, that side should take advantage of LocalShuffleRead optimization
[ https://issues.apache.org/jira/browse/SPARK-39126?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Apache Spark reassigned SPARK-39126:
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Assignee: Apache Spark
> 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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