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https://issues.apache.org/jira/browse/CALCITE-5149?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Chunwei Lei updated CALCITE-5149:
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Summary: Refine RelMdColumnUniqueness for Aggregate by considering
intersect keys (was: Refine RelMdColumnUniqueness for Window by considering
partition keys)
> Refine RelMdColumnUniqueness for Aggregate by considering intersect keys
> ------------------------------------------------------------------------
>
> Key: CALCITE-5149
> URL: https://issues.apache.org/jira/browse/CALCITE-5149
> Project: Calcite
> Issue Type: Improvement
> Reporter: Chunwei Lei
> Assignee: Chunwei Lei
> Priority: Major
>
> Currently, RelMdColumnUniqueness always returns null when meeting the Window
> operator. We can improve it by considering its partition keys. For instance,
> {code:java}
> select empno, rank () over (partition by empno order by empno) as rn from
> emp{code}
> If {{empno}} is the primary key of the table, {{empno}} is unique obviously.
>
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