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https://issues.apache.org/jira/browse/CALCITE-900?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14909606#comment-14909606
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Sean Hsuan-Yi Chu commented on CALCITE-900:
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The solution in the patch was just letting this rule fire. And if the project
above is a trivial one, remove it.
I think you suggest letting the removing business to another rule.
I agree this, which keeps this rule's purpose focused.
> ProjectSetOpTransposeRule can be improved when the input is a SetOperator
> with Trivial Project on top
> -----------------------------------------------------------------------------------------------------
>
> Key: CALCITE-900
> URL: https://issues.apache.org/jira/browse/CALCITE-900
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Reporter: Sean Hsuan-Yi Chu
> Assignee: Sean Hsuan-Yi Chu
>
> When SetOperator with Trivial Project on top, pushing this trivial project
> does not necessary. An improvement can be done if we just discard this
> trivial project.
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