Chunwei Lei created CALCITE-5149:
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Summary: Refine RelMdColumnUniqueness for Window by considering
partition keys
Key: CALCITE-5149
URL: https://issues.apache.org/jira/browse/CALCITE-5149
Project: Calcite
Issue Type: Improvement
Reporter: Chunwei Lei
Assignee: Chunwei Lei
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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