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https://issues.apache.org/jira/browse/CALCITE-4023?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17116882#comment-17116882
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Xiening Dai commented on CALCITE-4023:
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Is this a bug to fix or the rule is just useless?
> Remove or deprecate ProjectSortTransposeRule
> --------------------------------------------
>
> Key: CALCITE-4023
> URL: https://issues.apache.org/jira/browse/CALCITE-4023
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Reporter: Haisheng Yuan
> Priority: Major
>
> It never worked. The check condition {{if (sort.getClass() != Sort.class)}}
> is always true.
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