hsyuan commented on issue #1469: [CALCITE-3367] Add AntiJoinRule to convert project-filter-join-aggreg… URL: https://github.com/apache/calcite/pull/1469#issuecomment-534819486 I agree that people may still write queries with direct SEMI/ANIT join, but what the `SemiJoinRule` does is transforming a join on top of aggregate into a semijoin. In many cases, the pattern is generated by decorrelating an IN/EXIST subquery (in boolean context).
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