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https://issues.apache.org/jira/browse/CALCITE-4726?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17397698#comment-17397698
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Julian Hyde commented on CALCITE-4726:
--------------------------------------
On reflection, I think that adding {{SqlAggFunction.ignoresNullsByDefault}}
should be a separate JIRA case. If you decide to do that work, do it as a
separate commit, and we can associate with a JIRA case number later. All
commits can be in the same PR.
> Add support for filters in AggregateExpandWithinDistinctRule
> ------------------------------------------------------------
>
> Key: CALCITE-4726
> URL: https://issues.apache.org/jira/browse/CALCITE-4726
> Project: Calcite
> Issue Type: Improvement
> Reporter: Will Noble
> Priority: Blocker
>
> Currently, {{AggregateExpandWithinDistinctRule}} does not fire if any of the
> aggregate calls in the aggregate have a filter. We should support filters.
> For example, the following query will not be handled by the current rule due
> to the {{FILTER}} clause:
> {code:java}
> SELECT deptno,
> SUM(sal),
> SUM(sal) WITHIN DISTINCT (job) FILTER (WHERE ename LIKE 'A%')
> FROM emp
> GROUP BY deptno
> {code}
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