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https://issues.apache.org/jira/browse/CALCITE-1166?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Julian Hyde resolved CALCITE-1166.
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Resolution: Fixed
Fixed in http://git-wip-us.apache.org/repos/asf/calcite/commit/d81133fd.
> Disallow sub-classes of RelOptRuleOperand
> -----------------------------------------
>
> Key: CALCITE-1166
> URL: https://issues.apache.org/jira/browse/CALCITE-1166
> Project: Calcite
> Issue Type: Bug
> Reporter: Julian Hyde
> Assignee: Julian Hyde
>
> Disallow sub-classes of {{RelOptRuleOperand}}. The only reason that people
> have sub-classed {{RelOptRuleOperand}} is to override the {{boolean
> matches(RelNode)}} method, and you can now achieve that by supplying a
> {{Predicate}} to the constructor.
> Next release, we will deprecate {{RelOptRuleOperand}}'s protected constructor
> and create a new private or package-protected one. Later we will remove that
> constructor.
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