Julian Hyde commented on CALCITE-328:

Since we added SemiJoin in CALCITE-368 we will probably never add 
{{eliminateRightDuplicates}}, though it would help us with NOT EXISTS (see 

> Introduce semi-join-like flag in JoinRelBase
> --------------------------------------------
>                 Key: CALCITE-328
>                 URL: https://issues.apache.org/jira/browse/CALCITE-328
>             Project: Calcite
>          Issue Type: Bug
>            Reporter: Laljo John Pullokkaran
>            Assignee: Julian Hyde
> Introduce a flag to indicate that duplicates are eliminated from RHS of the 
> join (semiJoin). This would help to improve cardinality, cost estimation.

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