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https://issues.apache.org/jira/browse/CALCITE-4017?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17113578#comment-17113578
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Haisheng Yuan commented on CALCITE-4017:
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Thanks for confirming. I just noticed that EnumerableUnion doesn't have the
option to preserve ordering. Then we don't need to implement the trait
propagation for Union, until EnumerableUnion provide this mechanism. Let's
leave it open for now.
> Implement trait propagation for Enumerable Setop
> -------------------------------------------------
>
> Key: CALCITE-4017
> URL: https://issues.apache.org/jira/browse/CALCITE-4017
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Reporter: Haisheng Yuan
> Priority: Major
>
> Mainly for Union operator, not sure about Minus and Intersect. I haven't
> check how is Enumerable Minus, Intersect's executor implemented.
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