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From "Gopal V (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (HIVE-16182) Semijoin: Avoid VectorHashKeyWrapper allocations for the bloom hash aggregate
Date Sat, 11 Mar 2017 19:22:04 GMT

     [ https://issues.apache.org/jira/browse/HIVE-16182?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Gopal V reassigned HIVE-16182:
------------------------------

    Assignee: Gopal V

> 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
>         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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