jinxing64 commented on issue #1451: [CALCITE-3334] Refinement for Substitution-Based MV Matching URL: https://github.com/apache/calcite/pull/1451#issuecomment-540491439 I added rule of `UnionOnCalcsToUnionUnifyRule` in current change to improve matching ability for Union operator, which was introduced in [design doc](https://docs.google.com/document/d/1JpwGNFE3hw3yXb7W3-95-jXKClZC5UFPKbuhgYDuEu4/edit#heading=h.bmvjxz1h5evc)
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