jinxing64 commented on issue #1391: [CALCITE-3214] Add UnionToUnionRule for materialization matching (refine rule name) URL: https://github.com/apache/calcite/pull/1391#issuecomment-522513302 And I also want mention a question here: If I want to add a MV matching rule, where is the proper place, SubstitutionVisitor or MaterializedViewSubstitutionVisitor ? what is the criterion ?
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