cndaimin opened a new pull request #1531: [CALCITE-3447]Fix `equals` and `hashcode` methods of class `MutableScan` URL: https://github.com/apache/calcite/pull/1531 Code segment here depends on `hashcode` and `equals` methods of class `MutableRel`: https://github.com/apache/calcite/blob/master/core/src/main/java/org/apache/calcite/plan/SubstitutionVisitor.java#L492-L502 However the implementations of class `MutableScan` delegates to class `TableScan`, which directly relies on implementations of class `Object`. This leads to a situation that two `MutableScan` on the exactly same table will not be considered as equivalent.
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