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Posted to issues@spark.apache.org by "Apache Spark (Jira)" <ji...@apache.org> on 2021/09/17 19:07:00 UTC

[jira] [Commented] (SPARK-36794) Ignore duplicated join keys when building relation for SEMI/ANTI hash join

    [ https://issues.apache.org/jira/browse/SPARK-36794?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17416879#comment-17416879 ] 

Apache Spark commented on SPARK-36794:
--------------------------------------

User 'c21' has created a pull request for this issue:
https://github.com/apache/spark/pull/34034

> Ignore duplicated join keys when building relation for SEMI/ANTI hash join
> --------------------------------------------------------------------------
>
>                 Key: SPARK-36794
>                 URL: https://issues.apache.org/jira/browse/SPARK-36794
>             Project: Spark
>          Issue Type: Sub-task
>          Components: SQL
>    Affects Versions: 3.3.0
>            Reporter: Cheng Su
>            Priority: Minor
>
> For LEFT SEMI and LEFT ANTI hash equi-join without extra join condition, we only need to keep one row per unique join key(s) inside hash table (`HashedRelation`) when building the hash table. This can help reduce the size of hash table of join.



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