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https://issues.apache.org/jira/browse/CALCITE-1166?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16759508#comment-16759508
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Julian Hyde commented on CALCITE-1166:
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Yes, but with a builder, {{unordered()}} could simply set a flag; the inputs
would be specified in the ordinary way.
> 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
> Priority: Major
> Fix For: 1.8.0
>
>
> 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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