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https://issues.apache.org/jira/browse/CALCITE-878?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17276577#comment-17276577
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Julian Hyde commented on CALCITE-878:
-------------------------------------
As of CALCITE-2224, we support the "COLLECT ... WITHIN GROUP" syntax.
> Allow ORDER BY within COLLECT (an Oracle extension)
> ---------------------------------------------------
>
> Key: CALCITE-878
> URL: https://issues.apache.org/jira/browse/CALCITE-878
> Project: Calcite
> Issue Type: Bug
> Reporter: Julian Hyde
> Priority: Major
>
> Oracle allows ORDER BY within the COLLECT aggregate function, e.g.
> {code}SELECT deptno, COLLECT(emp_type(ename, sal) ORDER BY sal DESC) emps
> FROM emp
> GROUP BY deptno{code}
> This is an Oracle-specific extension to SQL:2011 but nevertheless useful and
> worth considering.
> Note that Calcite already supports DISTINCT within COLLECT.
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