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https://issues.apache.org/jira/browse/SPARK-28645?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17239032#comment-17239032
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Apache Spark commented on SPARK-28645:
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User 'beliefer' has created a pull request for this issue:
https://github.com/apache/spark/pull/30512
> Throw an error on window redefinition
> -------------------------------------
>
> Key: SPARK-28645
> URL: https://issues.apache.org/jira/browse/SPARK-28645
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 3.0.0
> Reporter: Dylan Guedes
> Priority: Major
>
> Currently in Spark one could redefine a window. For instance:
> {code:sql}select count(*) OVER w FROM tenk1 WINDOW w AS (ORDER BY unique1), w
> AS (ORDER BY unique1);{code}
> The window `w` is defined two times. In PgSQL, on the other hand, a thrown
> will happen:
> {code:sql}ERROR: window "w" is already defined{code}
>
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