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From "Sergey Shelukhin (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-16182) Semijoin: Avoid VectorHashKeyWrapper allocations for the bloom hash aggregate
Date Sun, 12 Mar 2017 00:11:04 GMT

    [ https://issues.apache.org/jira/browse/HIVE-16182?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15906363#comment-15906363
] 

Sergey Shelukhin commented on HIVE-16182:
-----------------------------------------

+1

> Semijoin: Avoid VectorHashKeyWrapper allocations for the bloom hash aggregate
> -----------------------------------------------------------------------------
>
>                 Key: HIVE-16182
>                 URL: https://issues.apache.org/jira/browse/HIVE-16182
>             Project: Hive
>          Issue Type: Improvement
>          Components: Vectorization
>    Affects Versions: 2.2.0
>            Reporter: Gopal V
>            Assignee: Gopal V
>              Labels: performance
>         Attachments: HIVE-16182.1.patch
>
>
> To avoid GC spam during the hash aggregate part of the bloom filter, the key for the
semijoin can be special-cased as an immutable empty key.



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