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https://issues.apache.org/jira/browse/CALCITE-3681?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17009157#comment-17009157
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Julian Hyde commented on CALCITE-3681:
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Yes, it is used. Some rules rely on it being correct.
> Refine RelMdColumnUniqueness and RelMdRowCount for Aggregate
> ------------------------------------------------------------
>
> Key: CALCITE-3681
> URL: https://issues.apache.org/jira/browse/CALCITE-3681
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Affects Versions: 1.21.0
> Reporter: Vladimir Sitnikov
> Assignee: Vladimir Sitnikov
> Priority: Major
>
> Aggregate might have grouping sets, so
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