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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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