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From "Gopal V (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-16533) Vectorization: Avoid evaluating empty groupby keys
Date Tue, 25 Apr 2017 21:06:04 GMT

     [ https://issues.apache.org/jira/browse/HIVE-16533?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Gopal V updated HIVE-16533:
---------------------------
    Description: 
VectorHashKeyWrapperBatch::evaluateBatch() dirties the L1 cache and slows down simple count/sum/min/max
queries.

Everything done inside that function is a no-op after HIVE-16182

!perf-top-gby.png!

  was:
VectorHashKeyWrapperBatch::evaluateBatch() dirties the L1 cache and slows down simple count/sum/min/max
queries.

Everything done inside that function is a no-op after HIVE-16182


> Vectorization: Avoid evaluating empty groupby keys
> --------------------------------------------------
>
>                 Key: HIVE-16533
>                 URL: https://issues.apache.org/jira/browse/HIVE-16533
>             Project: Hive
>          Issue Type: Bug
>          Components: Vectorization
>    Affects Versions: 2.1.1, 3.0.0
>            Reporter: Gopal V
>            Assignee: Gopal V
>         Attachments: perf-top-gby.png
>
>
> VectorHashKeyWrapperBatch::evaluateBatch() dirties the L1 cache and slows down simple
count/sum/min/max queries.
> Everything done inside that function is a no-op after HIVE-16182
> !perf-top-gby.png!



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