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https://issues.apache.org/jira/browse/CALCITE-1634?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15875642#comment-15875642
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Julian Hyde commented on CALCITE-1634:
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I missed one reference log; I fixed it along with CALCITE-1649.
> Make RelBuilder.distinct no-op if input is already distinct
> -----------------------------------------------------------
>
> Key: CALCITE-1634
> URL: https://issues.apache.org/jira/browse/CALCITE-1634
> Project: Calcite
> Issue Type: Bug
> Reporter: Julian Hyde
> Assignee: Julian Hyde
> Fix For: 1.12.0
>
>
> If the input is already distinct (i.e. some subset of the columns form a
> key), the {{RelBuilder.distinct}} method should do nothing.
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