[jira] [Commented] (SPARK-32129) Support AQE skew join with Union

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

    [ https://issues.apache.org/jira/browse/SPARK-32129?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17147828#comment-17147828 ] 

Apache Spark commented on SPARK-32129:
--------------------------------------

User 'LantaoJin' has created a pull request for this issue:
https://github.com/apache/spark/pull/28947

> Support AQE skew join with Union
> --------------------------------
>
>                 Key: SPARK-32129
>                 URL: https://issues.apache.org/jira/browse/SPARK-32129
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 3.0.0, 3.1.0
>            Reporter: Lantao Jin
>            Priority: Major
>
> Current, the AQE skew join only supports two tables join such as
> {code}
> SMJ
> :-Sort
> :    +-Shuffle
> +-Sort
>      +-Shuffle
> {code}
> But if the plan contains a Union, the skew join handling not work:
> {code}
> Union
> :-SMJ
> :   :-Sort
> :   :    +-Shuffle
> :   +-Sort
> :        +-Shuffle
> +-SMJ
> :   :-Sort
> :   :    +-Shuffle
> :   +-Sort
>          +-Shuffle
> {code}



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