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https://issues.apache.org/jira/browse/CALCITE-4011?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17112660#comment-17112660
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Rui Wang commented on CALCITE-4011:
-----------------------------------
Thanks for your patient and detailed explanation. Now I can that it is
"EnumerableConvention.enforce" that will create the EnumerableSort (enforce
traits, of course).
I have updated https://github.com/apache/calcite/pull/1985 to demonstrate
traits pass down in EnumerableProject and EnumerableFilter. Please take a look.
I didn't implement traits derivation. (cause I didn't find an example from
#1953). Please let me know if you think the traits derivation should be include
in the same pull request.
> 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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