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https://issues.apache.org/jira/browse/CALCITE-750?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15304966#comment-15304966
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Gautam Kumar Parai commented on CALCITE-750:
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I have created a pull request for this enhancement:
https://github.com/apache/calcite/pull/238
Please take a look and provide feedback. Thanks!
> Window aggregate on top of a regular aggregate expression fails
> ---------------------------------------------------------------
>
> Key: CALCITE-750
> URL: https://issues.apache.org/jira/browse/CALCITE-750
> Project: Calcite
> Issue Type: Bug
> Affects Versions: 1.3.0-incubating
> Reporter: Aman Sinha
> Assignee: Gautam Kumar Parai
>
> Window aggregate on top of a regular aggregate expression is a valid query
> but currently fails with a 'aggregate expression cannot be nested' error.
> {code}
> SELECT avg(sum(sal)) over (partition by deptno) from emp group by deptno;
> SEVERE: org.apache.calcite.sql.validate.SqlValidatorException: Aggregate
> expressions cannot be nested
> {code}
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