[
https://issues.apache.org/jira/browse/HIVE-16533?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15985608#comment-15985608
]
Sergey Shelukhin commented on HIVE-16533:
-----------------------------------------
+1
> 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!
--
This message was sent by Atlassian JIRA
(v6.3.15#6346)
