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https://issues.apache.org/jira/browse/HIVE-16533?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gopal V updated HIVE-16533:
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Status: Patch Available (was: Open)
> 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: HIVE-16533.1.patch, 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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