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https://issues.apache.org/jira/browse/SPARK-52921?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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L. C. Hsieh resolved SPARK-52921.
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Fix Version/s: 4.1.0
Resolution: Fixed
Issue resolved by pull request 51623
[https://github.com/apache/spark/pull/51623]
> Specify outputPartitioning for UnionExec for partitioner aware case
> -------------------------------------------------------------------
>
> Key: SPARK-52921
> URL: https://issues.apache.org/jira/browse/SPARK-52921
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 4.1.0
> Reporter: L. C. Hsieh
> Assignee: L. C. Hsieh
> Priority: Major
> Labels: pull-request-available
> Fix For: 4.1.0
>
>
> Currently the output partitioning of UnionExec is simply unknown. But if the
> partitioner is known to be the same for all children RDDs, SparkContext.union
> produces a PartitionerAwareUnionRDD which reuses the partition. For such
> cases, the output partitioning of UnionExec is actually known to be the same
> as its children nodes.
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