julianhyde commented on issue #1469: [CALCITE-3367] Add AntiJoinRule to convert project-filter-join-aggreg… URL: https://github.com/apache/calcite/pull/1469#issuecomment-534818701 We should definitely keep `SemiJoinRule` around. People may still write queries that do semi-joins without using IN or EXISTS. I agree that we could have a direct path from IN/EXISTS to semi- or anti-semi Join. As long as it doesn't add too much code. (If it adds code, that code will probably be wrong at first, because IN/EXISTS are very complicated, and will definitely need maintaining.)
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