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Posted to issues-all@impala.apache.org by "Tim Armstrong (JIRA)" <ji...@apache.org> on 2019/04/09 21:51:00 UTC

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

Tim Armstrong created IMPALA-8402:
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             Summary: 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


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.



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