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From "Laszlo Bodor (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-18866) Semijoin: Implement a Long -> Hash64 vector fast-path
Date Wed, 16 May 2018 08:57:00 GMT

    [ https://issues.apache.org/jira/browse/HIVE-18866?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16477098#comment-16477098
] 

Laszlo Bodor commented on HIVE-18866:
-------------------------------------

[~gopalv] : would you mind if I assign this task to me? I was working on HIVE-19501, but
it becomes unnecessary with this patch.

> Semijoin: Implement a Long -> Hash64 vector fast-path
> -----------------------------------------------------
>
>                 Key: HIVE-18866
>                 URL: https://issues.apache.org/jira/browse/HIVE-18866
>             Project: Hive
>          Issue Type: Improvement
>          Components: Vectorization
>            Reporter: Gopal V
>            Priority: Major
>              Labels: performance
>         Attachments: 0001-hash64-WIP.patch, perf-hash64-long.png
>
>
> A significant amount of CPU is wasted with JMM restrictions on byte[] arrays.
> To transform from one Long -> another Long, this goes into a byte[] array, which shows
up as a hotspot.
> !perf-hash64-long.png!



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