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https://issues.apache.org/jira/browse/SPARK-28645?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wenchen Fan resolved SPARK-28645.
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Fix Version/s: 3.1.0
Resolution: Fixed
Issue resolved by pull request 30512
[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
> Assignee: jiaan.geng
> Priority: Major
> Fix For: 3.1.0
>
>
> 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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