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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