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Ruben Quesada Lopez commented on CALCITE-2621:
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I'll work on some unit tests.
The idea behind the function is to make configurable the SemiJoinType of the
generated LogicalCorrelate. In the original JoinToCorrelateRule it was
{{SemiJoinType.of(join.getJoinType())}}, but in the new SemiJoinToCorrelateRule
it will be simply {{SemiJoinType.SEMI}}. Maybe there is a simpler way to
extract this information from the Join instance that I'm not aware of...
> 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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