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Posted to issues@spark.apache.org by "Apache Spark (Jira)" <ji...@apache.org> on 2020/08/08 09:49:00 UTC
[jira] [Commented] (SPARK-32573) Eliminate Anti Join when BuildSide
is Empty
[ https://issues.apache.org/jira/browse/SPARK-32573?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17173623#comment-17173623 ]
Apache Spark commented on SPARK-32573:
--------------------------------------
User 'leanken' has created a pull request for this issue:
https://github.com/apache/spark/pull/29389
> Eliminate Anti Join when BuildSide is Empty
> -------------------------------------------
>
> Key: SPARK-32573
> URL: https://issues.apache.org/jira/browse/SPARK-32573
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.0.0
> Reporter: Leanken.Lin
> Priority: Minor
>
> In [SPARK-32290|https://issues.apache.org/jira/browse/SPARK-32290], we introduced several new types of HashedRelation
> * EmptyHashedRelation
> * EmptyHashedRelationWithAllNullKeys
> They were all limited to used only in NAAJ scenario. But as for a improvement, EmptyHashedRelation could also be used in Normal AntiJoin for fast stop, and as for in AQE, we can even eliminate anti join when we knew that buildSide is empty.
>
> This Patch including two changes.
> In Non-AQE, using EmptyHashedRelation to do fast stop for common anti join as well
> In AQE, eliminate anti join if buildSide is a EmptyHashedRelation of ShuffleWriteRecord is 0
>
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