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https://issues.apache.org/jira/browse/CALCITE-4012?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17112159#comment-17112159
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Haisheng Yuan commented on CALCITE-4012:
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Yes, it is {{RelDistributionTraitDef}}. In Calcite, it is represented by
RelDistribution with type "HASH". In this JIRA, it has nothing to do with
distribution, because EnumerableConvention doesn't support distributed
computing. So we only need consider collation for the moment.
> Implement trait propagation for EnumerableHashJoin and
> EnumerableNestedLoopJoin
> -------------------------------------------------------------------------------
>
> Key: CALCITE-4012
> URL: https://issues.apache.org/jira/browse/CALCITE-4012
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Reporter: Haisheng Yuan
> Priority: Major
>
> The traitset can be derived from the outer relation of
> hashjoin/nestedloopjoin.
> They can also pass down parent trait request to their outer child.
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