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https://issues.apache.org/jira/browse/CALCITE-328?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15713456#comment-15713456
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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
CALCITE-374).
> 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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