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https://issues.apache.org/jira/browse/CALCITE-632?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14372215#comment-14372215
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Jesus Camacho Rodriguez commented on CALCITE-632:
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[~julianhyde], I have created the new pull request.
> Sort order returned by SUPERCLASS_COMPARATOR in ReflectiveRelMetadataProvider
> is inconsistent
> ---------------------------------------------------------------------------------------------
>
> Key: CALCITE-632
> URL: https://issues.apache.org/jira/browse/CALCITE-632
> Project: Calcite
> Issue Type: Bug
> Reporter: Jesus Camacho Rodriguez
> Assignee: Jesus Camacho Rodriguez
>
> By default, 1 is returned. However, when none of the classes is a super class
> of the other one, this could lead to inconsistent order as the Comparable
> will return the same result e.g. compare(Exchange, Sort) = 1 and
> compare(Sort, Exchange) = 1.
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