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https://issues.apache.org/jira/browse/SPARK-34548?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17294221#comment-17294221
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Apache Spark commented on SPARK-34548:
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User 'viirya' has created a pull request for this issue:
https://github.com/apache/spark/pull/31716
> Remove unnecessary children from Union under Distince and Deduplicate
> ---------------------------------------------------------------------
>
> Key: SPARK-34548
> URL: https://issues.apache.org/jira/browse/SPARK-34548
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.2.0
> Reporter: L. C. Hsieh
> Assignee: L. C. Hsieh
> Priority: Major
> Fix For: 3.2.0
>
>
> If there are any duplicate child of Union under Distince and Deduplicate, it
> can be removed to simplify query plan.
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