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https://issues.apache.org/jira/browse/SPARK-28566?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Xiao Li resolved SPARK-28566.
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Resolution: Won't Fix
> window functions should not be allowed in window definitions
> ------------------------------------------------------------
>
> Key: SPARK-28566
> URL: https://issues.apache.org/jira/browse/SPARK-28566
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 3.0.0
> Reporter: Dylan Guedes
> Priority: Major
>
> Currently, Spark allows the usage of window functions inside window
> definitions, such as:
> {code:sql}
> SELECT rank() OVER (ORDER BY rank() OVER (ORDER BY random()));{code}
> However, in PgSQL such behavior is now allowed:
> {code:sql}
> postgres=# SELECT rank() OVER (ORDER BY rank() OVER (ORDER BY random()));
> ERROR: window functions are not allowed in window definitions
> LINE 1: SELECT rank() OVER (ORDER BY rank() OVER (ORDER BY random())...{code}
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