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https://issues.apache.org/jira/browse/CALCITE-2621?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16646354#comment-16646354
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Ruben Quesada Lopez commented on CALCITE-2621:
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A possible way to implement this could be generalizing JoinToCorrelateRule with
a parameterized constructor to support any sub-class of
org.apache.calcite.rel.core.Join, and not just
org.apache.calcite.rel.logical.LogicalJoin.
Then, the new SemiJoinToCorrelateRule could use this feature.
> 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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