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https://issues.apache.org/jira/browse/SPARK-50838?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wenchen Fan resolved SPARK-50838.
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Fix Version/s: 4.0.0
Resolution: Fixed
Issue resolved by pull request 49518
[https://github.com/apache/spark/pull/49518]
> Implement checkRecursion to check if all the rules about recursive queries
> are fulfilled. Adjust optimizer with Unionloop cases.
> --------------------------------------------------------------------------------------------------------------------------------
>
> Key: SPARK-50838
> URL: https://issues.apache.org/jira/browse/SPARK-50838
> Project: Spark
> Issue Type: Sub-task
> Components: Spark Core
> Affects Versions: 4.0.0
> Reporter: Milan Cupac
> Assignee: Milan Cupac
> Priority: Major
> Labels: pull-request-available
> Fix For: 4.0.0
>
>
> Add checkRecursion to check if all the rules about recursive queries are
> fullfilled.
> # Recursive term can contain one recursive reference only.
> # Recursive reference can't be used in some kinds of joins and aggregations.
> Add small changes to the optimizer in case UnionLoop node is encountered.
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