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https://issues.apache.org/jira/browse/CALCITE-3447?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jin Xing reassigned CALCITE-3447:
---------------------------------
Assignee: Jin Xing
> 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
> Assignee: Jin Xing
> Priority: Minor
> Labels: pull-request-available
> Fix For: 1.23.0
>
> Time Spent: 7h
> Remaining Estimate: 0h
>
> 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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