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https://issues.apache.org/jira/browse/CALCITE-4011?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17112445#comment-17112445
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Haisheng Yuan commented on CALCITE-4011:
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It is recommended to override {{passThroughTraits}}, instead of
{{passThrough}}, unless {{passThrough}}'s default implementation doesn't
satisfy the user's needs, which is useful when migrating to top-down
optimization if some system already has its own implementation of trait
propagation based on AbstractConverter.
> Implement trait propagation for EnumerableProject and EnumerableFilter
> ----------------------------------------------------------------------
>
> Key: CALCITE-4011
> URL: https://issues.apache.org/jira/browse/CALCITE-4011
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Reporter: Haisheng Yuan
> Assignee: Rui Wang
> Priority: Major
> Time Spent: 0.5h
> Remaining Estimate: 0h
>
> So that parent trait can be passed down, and it can derive new traitsets from
> child. Most importantly, as a demonstration. So that SortProjectTransposeRule
> and ProjectSortTransposeRule can be disabled when topDownOpt is enabled.
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