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https://issues.apache.org/jira/browse/CALCITE-6611?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17887210#comment-17887210
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Caican Cai commented on CALCITE-6611:
-------------------------------------
good catch
> Rules that modify the sort collation cannot be applied in VolcanoPlanner
> ------------------------------------------------------------------------
>
> Key: CALCITE-6611
> URL: https://issues.apache.org/jira/browse/CALCITE-6611
> Project: Calcite
> Issue Type: Bug
> Reporter: suibianwanwan
> Priority: Critical
>
> In VolcanoPlanner, the input to a RelNode is RelSubset, and when connecting
> nodes, the TraitSet that looks up the input in the RelSet it belongs to looks
> up the RelNode that satisfies it.
> If we modify the TraitSet of a relNode and register the new relNode in the
> VolcanoPlanner, the new relNode will not be selected by the parent.
> Take SortRemoveConstantKeyRule as an example, suppose the original ordering
> is [0,1].
> If we optimize the order to [1], then because the input of the parent is
> RelSubset([0,1]), the parent will not choose the RelNode after applying the
> rule.
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