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https://issues.apache.org/jira/browse/CALCITE-4004?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17107709#comment-17107709
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Julian Hyde commented on CALCITE-4004:
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Technically you're overriding Object.toString() in RelOptRuleOperand. (We don't
encourage people sub-classing RelOptRuleOperand, and we may ban it at some
point.)
> Override RelOptRuleOperand.toString()
> -------------------------------------
>
> Key: CALCITE-4004
> URL: https://issues.apache.org/jira/browse/CALCITE-4004
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Reporter: Haisheng Yuan
> Priority: Major
>
> Override RelOptRuleOperand.toString() to facilitate debugging, otherwise, it
> is so tedious...
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