rubenada commented on issue #1247: [CALCITE-3089] Deprecate EquiJoin URL: https://github.com/apache/calcite/pull/1247#issuecomment-519015927 @danny0405 @hsyuan What if we added a new method to `Join`, something like: `public boolean supportsNonEquiJoin()` with a default implementation that just `return true`, and then each physical Join implementation that supports only EquiJoin conditions (like `EnumerableHashJoin` / `EnumerableMergeJoin`) will have to override it to `return false`. This method could be use as verification check by the rules, replacing somehow the current `RelOptUtil#forceEquiJoin` (which is removed by the current patch).
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