hsyuan edited a comment on issue #1469: [CALCITE-3367] Add AntiJoinRule to convert project-filter-join-aggreg… URL: https://github.com/apache/calcite/pull/1469#issuecomment-534824750 > Ideally it would also match Join(Scan(emp), Scan(dept)) (i.e. without the Aggregate) provided that there was a uniqueness constraint. If there is a uniqueness constraint, what is the value of transforming into a semijoin? I don't think there is any benefit.
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