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https://issues.apache.org/jira/browse/CALCITE-750?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15314692#comment-15314692
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Julian Hyde commented on CALCITE-750:
-------------------------------------
[~gparai], Much improved - thanks. I have done some cleanup at
https://github.com/julianhyde/calcite/tree/750-win-agg-on-regular-agg, removing
mutable state that made it difficult to understand what was going on. I'm
working on further cleanup before I commit.
> Allow windowed aggregate on top of regular aggregate
> ----------------------------------------------------
>
> 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: Julian Hyde
>
> 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}
> We should allow one level nesting of aggregates under window aggregates, i.e.
> {{window_agg(regular_agg(args)) over window}}.
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