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Posted to issues-all@impala.apache.org by "Csaba Ringhofer (JIRA)" <ji...@apache.org> on 2019/04/10 10:18:00 UTC

[jira] [Updated] (IMPALA-8402) Add targeted perf tests for CHAR

     [ https://issues.apache.org/jira/browse/IMPALA-8402?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Csaba Ringhofer updated IMPALA-8402:
------------------------------------
    Description: 
This is follow-on from IMPALA-7331. We don't currently have targeted perf coverage for CHAR as a result of not having any CHAR-type columns in TPC-H or TPC-DS.

CHAR is not a preferred data type in Impala because of the "interesting" space-padding semantics and limited codegen support but people do use it in production. It would be nice to have a way to measure perf regressions or take credit for perf wins if/when we enabled codegen for it.

  was:
This is follow-on from IMPALA-7331. We don't currently have targeted perf coverage for CHAR as a result of not having any CHAR-type columns in TPC-H or TPC-DS.

CHAR is not a preferred data tyandpe in Impala because of the "interesting" space-padding semantics and limited codegen support but people do use it in production. It would be nice to have a way to measure perf regressions or take credit for perf wins if/when we enabled codegen for it.


> Add targeted perf tests for CHAR
> --------------------------------
>
>                 Key: IMPALA-8402
>                 URL: https://issues.apache.org/jira/browse/IMPALA-8402
>             Project: IMPALA
>          Issue Type: Improvement
>          Components: Infrastructure
>            Reporter: Tim Armstrong
>            Priority: Minor
>              Labels: perf
>
> This is follow-on from IMPALA-7331. We don't currently have targeted perf coverage for CHAR as a result of not having any CHAR-type columns in TPC-H or TPC-DS.
> CHAR is not a preferred data type in Impala because of the "interesting" space-padding semantics and limited codegen support but people do use it in production. It would be nice to have a way to measure perf regressions or take credit for perf wins if/when we enabled codegen for it.



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