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https://issues.apache.org/jira/browse/SPARK-52430?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wenchen Fan resolved SPARK-52430.
---------------------------------
Fix Version/s: 4.1.0
Resolution: Fixed
Issue resolved by pull request 51134
[https://github.com/apache/spark/pull/51134]
> Resolve bug with nullability of Union in rCTEs
> ----------------------------------------------
>
> Key: SPARK-52430
> URL: https://issues.apache.org/jira/browse/SPARK-52430
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 4.0.1
> Reporter: Pavle Martinović
> Assignee: Pavle Martinović
> Priority: Major
> Labels: pull-request-available
> Fix For: 4.1.0
>
>
> Currently, we mark the nullability of UnionLoopRef with the nullability of
> the anchor. However, the NULL may occur because of the recursive step,
> leading to unexpected behavior (treating NULLs as 0s).
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