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[jira] [Created] (CALCITE-2690) Uses ·getDescription· instead of ·toString· when gets RelNode's digest

godfrey he created CALCITE-2690:

             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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