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https://issues.apache.org/jira/browse/CALCITE-3666?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Vladimir Sitnikov updated CALCITE-3666:
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Summary: Refine RelMdUniqueKeys and RelMdColumnUniqueness for Calc (was:
Refine RelMdColumnUniqueness for Calc)
> Refine RelMdUniqueKeys and RelMdColumnUniqueness for Calc
> ---------------------------------------------------------
>
> Key: CALCITE-3666
> URL: https://issues.apache.org/jira/browse/CALCITE-3666
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.21.0
> Reporter: Vladimir Sitnikov
> Assignee: Vladimir Sitnikov
> Priority: Major
>
> RelMdColumnUniqueness does not have an override for Calc, thus it can't
> resolve uniqueness for EnumerableCalc
> In practice, it is hard to deduce uniqueness for select emp.id*emp.deptno
> from emp, however, simple projects can be resolved (e.g. when Calc selects
> one of its input as is).
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