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https://issues.apache.org/jira/browse/CALCITE-3428?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17934032#comment-17934032
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Julian Hyde commented on CALCITE-3428:
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[~ian.bertolacci], Can you please open a new case? Whether or not your concerns
are valid, no good comes of discussions on closed cases. When you've done that,
link to the new case and add one last comment.
> Refine RelMdColumnUniqueness for Filter by considering constant columns
> -----------------------------------------------------------------------
>
> Key: CALCITE-3428
> URL: https://issues.apache.org/jira/browse/CALCITE-3428
> Project: Calcite
> Issue Type: Improvement
> Reporter: Jin Xing
> Assignee: Jin Xing
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.22.0
>
> Time Spent: 50m
> Remaining Estimate: 0h
>
> AggregateRemoveRule fails to remove the top Aggregate for below SQL
> {code:java}
> select mgr, sum(sum_sal)
> from
> (select mgr, deptno, sum(sal) sum_sal
> from sales.emp
> group by mgr, deptno)
> where deptno=100
> group by mgr
> {code}
> The reason is that RelMdColumnUniqueness doesn't take the filtering condition
> into consideration when checking uniqueness of columns.
> This PR proposes to refine RelMdColumnUniqueness for Filter, thus to
> strengthen AggregateRemoveRule.
> Resolving this Jira will help a lot for CALCITE-3334 by removing the
> redundant compensation Aggregate when doing materialization matching
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