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https://issues.apache.org/jira/browse/CALCITE-1327?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15404920#comment-15404920
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Julian Hyde commented on CALCITE-1327:
--------------------------------------
The root cause was that CALCITE-750 was incomplete, because it was inadequately
tested. Let's not just chip away at the problem. I'll commit when we have all
the issues solved.
> Nested aggregate windowed query fails
> -------------------------------------
>
> Key: CALCITE-1327
> URL: https://issues.apache.org/jira/browse/CALCITE-1327
> Project: Calcite
> Issue Type: Bug
> Reporter: Gautam Kumar Parai
> Assignee: Gautam Kumar Parai
>
> Regression from CALCITE-750 Allow nested window aggregates.
> Calcite allows illegal queries instead of raising an appropriate error. When
> executing the following query calcite does not raise the following error.
> {code}
> select avg(sum(b)) over (partition by b) from t1;
> ERROR: Expression 'b' is not being grouped
> {code}
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