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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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Milan Cupac updated SPARK-50838:
--------------------------------
    Description: 
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.

> 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
>            Priority: Major
>              Labels: pull-request-available
>
> 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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