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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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Description:
For instance,
columns: [0, 1]
group by [0, 2]
If [0] is unique, then [0, 1] is unique too.
was:
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.
> 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
>
> For instance,
> columns: [0, 1]
> group by [0, 2]
> If [0] is unique, then [0, 1] is unique too.
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