danny0405 commented on issue #1469: [CALCITE-3367] Add AntiJoinRule to convert project-filter-join-aggreg… URL: https://github.com/apache/calcite/pull/1469#issuecomment-534814752 > I don't like the idea of `SemiJoinRule`, which is counter intuitive. A boolean context IN or existential subquery should be decorrelated directly into SEMI/ANTI SEMI join, rather than transforming to Join/Outer Join, then to SEMI/ANTI join. I'm +1 on this idea, we may need some refactoring for the RelDecorrelator.
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