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