daimin created CALCITE-3447:
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Summary: Fix equivalents in method SubstitutionVisitor#go
Key: CALCITE-3447
URL: https://issues.apache.org/jira/browse/CALCITE-3447
Project: Calcite
Issue Type: Bug
Components: core
Reporter: daimin
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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