[jira] [Commented] (CALCITE-900) ProjectSetOpTransposeRule can be improved when the input is a SetOperator with Trivial Project on top

["Sean Hsuan-Yi Chu (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CALCITE-900?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14939012#comment-14939012 ] 

Sean Hsuan-Yi Chu commented on CALCITE-900:
-------------------------------------------

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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