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https://issues.apache.org/jira/browse/CALCITE-3889?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17072808#comment-17072808
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Haisheng Yuan commented on CALCITE-3889:
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[~rkondakov] There is a fix for the bug you mentioned:
https://github.com/apache/calcite/pull/1879/files#diff-ef2c263b544b56d503d5332c1d76ef02R144
> Add apply(Mappings.Mapping) to RelTrait and RelTraitSet
> -------------------------------------------------------
>
> Key: CALCITE-3889
> URL: https://issues.apache.org/jira/browse/CALCITE-3889
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Reporter: Haisheng Yuan
> Priority: Major
>
> RelTrait Collation, Distribution have key indices, when we pass down the
> traitset to child or propagate to parent operator, we have to remap these
> keys. It would be nice to have {{apply(Mappings.Mapping)}} on RelTrait and
> RelTraitSet. RelDistribution already has the method, but we may want it on
> every RelTrait except Convention.
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