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https://issues.apache.org/jira/browse/SPARK-53382?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wenchen Fan resolved SPARK-53382.
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Fix Version/s: 4.1.0
Resolution: Fixed
Issue resolved by pull request 52115
[https://github.com/apache/spark/pull/52115]
> Fix bug with eliminated self reference
> --------------------------------------
>
> Key: SPARK-53382
> URL: https://issues.apache.org/jira/browse/SPARK-53382
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 4.1.0
> Reporter: Pavle Martinović
> Assignee: Pavle Martinović
> Priority: Major
> Labels: pull-request-available
> Fix For: 4.1.0
>
>
> There is currently a bug where rCTEs crash when the optimizer replaces parts
> of the plan that return empty results with an empty LocalRelation, which
> destroys the UnionLoopRef inside the recursion of the UnionLoop, which breaks
> the assumption in the Exec node that there will be a UnionLoopRef node there.
> This causes prevPlan to never be defined to a non-null value which causes an
> spark internal error when tried to evaluate.
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