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Posted to dev@calcite.apache.org by "Vladimir Sitnikov (Jira)" <ji...@apache.org> on 2020/01/02 13:19:00 UTC

[jira] [Created] (CALCITE-3666) Refine RelMdColumnUniqueness for Calc

Vladimir Sitnikov created CALCITE-3666:
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             Summary: Refine 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


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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