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https://issues.apache.org/jira/browse/SPARK-53040?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated SPARK-53040:
-----------------------------------
Labels: pull-request-available (was: )
> Ban self references inside topmost CTEs in Recursive CTEs
> ---------------------------------------------------------
>
> Key: SPARK-53040
> URL: https://issues.apache.org/jira/browse/SPARK-53040
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 4.1.0
> Reporter: Pavle Martinović
> Priority: Major
> Labels: pull-request-available
> Fix For: 4.1.0
>
>
> Currently for queries that become recursive because self references inside
> CTEs that apply to the whole union, but aren't called in the anchor are
> allowed. Most other engines ban this behavior. An example of an affected
> query:
>
> WITH RECURSIVE t1 AS (
> WITH t2(n ) AS (SELECT * FROM t1)
> SELECT 1 AS n
> UNION ALL
> SELECT n+1 FROM t2 WHERE n < 5)
> SELECT * FROM t1;
>
> This removes no functionality, since just moving the WITH beneath the UNION
> ALL will create an equivalent query.
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