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https://issues.apache.org/jira/browse/CALCITE-900?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14939012#comment-14939012
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Sean Hsuan-Yi Chu commented on CALCITE-900:
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The problem is we have observed volcano planning going on forever.
Initially, we thought that trivial project might be a problem. So we tried
something around that trivial project.
But I found out that it does not really resolve the problem.
Now I am trying to reproduce the problem in Calcite, without going to Drill.
That might narrow down things.
> 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: Julian Hyde
> Attachments: trace.log
>
>
> 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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