godfrey he created CALCITE-2690:
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Summary: Uses ·getDescription· instead of ·toString· when gets
RelNode's digest
Key: CALCITE-2690
URL: https://issues.apache.org/jira/browse/CALCITE-2690
Project: Calcite
Issue Type: Improvement
Components: core
Reporter: godfrey he
Assignee: Julian Hyde
Currently, We use a lot of RelNode's toString method to get digest. However the
semantics of `toString` method is ambiguity. If some developers do not know
the toString value of a RelNode will be used as digest and override toString
method arbitrarily, the optimization result will be unexpected. So I suggest
that we should use ·getDescription· instead of ·toString· to get RelNode's
digest in Calcite.
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