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Posted to issues@drill.apache.org by "wtf (Jira)" <ji...@apache.org> on 2021/12/21 07:11:00 UTC

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

     [ https://issues.apache.org/jira/browse/DRILL-8088?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

wtf updated DRILL-8088:
-----------------------
    Summary: Improve expression evaluation performance  (was: Improve expression generation performance)

> 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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