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https://issues.apache.org/jira/browse/CALCITE-750?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15315216#comment-15315216
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Julian Hyde commented on CALCITE-750:
-------------------------------------
[~gparai], OK, I've finished fix up. Please review my dev branch. If OK I'll
commit. (There are some cosmetic changes mixed in there, which I'll separate
out when I squash.)
> 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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