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https://issues.apache.org/jira/browse/CALCITE-2621?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16646484#comment-16646484
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Julian Hyde commented on CALCITE-2621:
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Can you add some tests?

Why do you need a function to derive SemiJoinType?

> New rule: SemiJoinToCorrelateRule (SemiJoin => LogicalCorrelate)
> ----------------------------------------------------------------
>
>                 Key: CALCITE-2621
>                 URL: https://issues.apache.org/jira/browse/CALCITE-2621
>             Project: Calcite
>          Issue Type: Improvement
>            Reporter: Ruben Quesada Lopez
>            Assignee: Julian Hyde
>            Priority: Major
>             Fix For: 1.18.0
>
>
> Similarly to JoinToCorrelateRule, in some contexts it might be interesting to 
> transform a SemiJoin into a LogicalCorrelate, for this purpose a 
> SemiJoinToCorrelateRule will be needed.



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