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https://issues.apache.org/jira/browse/CALCITE-800?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14630996#comment-14630996
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Vladimir Sitnikov commented on CALCITE-800:
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The standard is not clear -- see my 4.2.
> Window function defined within another window function should be invalid
> ------------------------------------------------------------------------
>
> Key: CALCITE-800
> URL: https://issues.apache.org/jira/browse/CALCITE-800
> Project: Calcite
> Issue Type: Bug
> Reporter: Sean Hsuan-Yi Chu
> Assignee: Julian Hyde
>
> For instance,
> {code}
> select sum(deptno) over (order by
> sum(deptno) over(order by deptno))
> from emp
> {code}
> This is an invalid query. However, it passes the validation.
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