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https://issues.apache.org/jira/browse/SPARK-34474?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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L. C. Hsieh resolved SPARK-34474.
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Fix Version/s: 3.2.0
Resolution: Fixed
Issue resolved by pull request 31595
[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
> Fix For: 3.2.0
>
>
> 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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