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https://issues.apache.org/jira/browse/CALCITE-2690?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16695457#comment-16695457
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Julian Hyde commented on CALCITE-2690:
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CALCITE-2471 and CALCITE-2690 are very closely related. Can you please work
with [~laurentgo] and figure out something that solves both?
> Uses `getDigest ` 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
> Priority: Major
>
> Currently, We use a lot of {{RelNode}}'s {{toString}} method to get digest in
> Calcite project. 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
> {{getDigest}} instead of {{toString}} to get {{RelNode}}'s digest.
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