julianhyde commented on issue #1469: [CALCITE-3367] Add AntiJoinRule to convert project-filter-join-aggreg… URL: https://github.com/apache/calcite/pull/1469#issuecomment-534823684 I am talking about the current rule, which transforms `Join(Scan(emp), Aggregate(Scan(dept)))` into `Join(SEMI, Scan(emp), Scan(dept))`. Ideally it would also match `Join(Scan(emp), Scan(dept))` (i.e. without the `Aggregate`) provided that there was a uniqueness constraint. The other direction is also valid, but as you say, we don't have that rule.
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