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https://issues.apache.org/jira/browse/CALCITE-4032?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17164144#comment-17164144
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Haisheng Yuan commented on CALCITE-4032:
----------------------------------------

With this change, the CalcMergeRule won't match PhysicalNode (including 
EnumerableCalc) in VolcanoPlanner.

Discussion:
https://lists.apache.org/thread.html/r615200d1af5ea7aa5e44aafa7220823d09053fd6a1fa411c60b51386%40%3Cdev.calcite.apache.org%3E



> Mark CalcMergeRule as TransformationRule
> ----------------------------------------
>
>                 Key: CALCITE-4032
>                 URL: https://issues.apache.org/jira/browse/CALCITE-4032
>             Project: Calcite
>          Issue Type: Improvement
>          Components: core
>            Reporter: Haisheng Yuan
>            Priority: Major
>             Fix For: 1.24.0
>
>          Time Spent: 0.5h
>  Remaining Estimate: 0h
>
> Previously it was removed in CALCITE-3997.



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