[jira] [Commented] (DRILL-8088) Improve expression evaluation performance

["ASF GitHub Bot (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/DRILL-8088?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17463034#comment-17463034 ] 

ASF GitHub Bot commented on DRILL-8088:
---------------------------------------

Leon-WTF opened a new pull request #2412:
URL: https://github.com/apache/drill/pull/2412


   # [DRILL-8088](https://issues.apache.org/jira/browse/DRILL-8088): Improve expression evaluation performance
   
   ## Description
   Remove unnessesery map copy each time when enter new scope.
   
   ## Documentation
   No need
   
   ## Testing
   Will be tested in many existed UT which query with "case when", e.g. ifExpression in TestLimit0VsRegularQueriesMetadata


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> Improve expression evaluation performance
> -----------------------------------------
>
>                 Key: DRILL-8088
>                 URL: https://issues.apache.org/jira/browse/DRILL-8088
>             Project: Apache Drill
>          Issue Type: Improvement
>          Components: Execution - Codegen
>            Reporter: wtf
>            Assignee: wtf
>            Priority: Minor
>
> Found unnessesery map copy when doing expression evaluation, it will slow down the codegen when the query include many "case when" or avg/stddev(the reduced expressions include "case when"). In our case, the query include 314 avg, it takes 3+ seconds to generate the projector expressions(Intel(R) Xeon(R) CPU E5-2682 v4 @ 2.50GHz 32cores).



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