[jira] [Commented] (SPARK-34474) Remove unnecessary Union under Distinct like operators

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

    [ https://issues.apache.org/jira/browse/SPARK-34474?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17287320#comment-17287320 ] 

Apache Spark commented on SPARK-34474:
--------------------------------------

User 'viirya' has created a pull request for this issue:
https://github.com/apache/spark/pull/31595

> Remove unnecessary Union under Distinct like operators
> ------------------------------------------------------
>
>                 Key: SPARK-34474
>                 URL: https://issues.apache.org/jira/browse/SPARK-34474
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 3.2.0
>            Reporter: L. C. Hsieh
>            Assignee: L. C. Hsieh
>            Priority: Major
>
> For an Union under Distinct like operators, if its children are all the same, we can just keep one among them and remove the Union.



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