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Posted to issues@hive.apache.org by "Mustafa İman (Jira)" <ji...@apache.org> on 2021/01/14 22:02:00 UTC

[jira] [Updated] (HIVE-24510) Vectorize compute_bit_vector

     [ https://issues.apache.org/jira/browse/HIVE-24510?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Mustafa İman updated HIVE-24510:
--------------------------------
    Fix Version/s: 4.0.0

> Vectorize compute_bit_vector
> ----------------------------
>
>                 Key: HIVE-24510
>                 URL: https://issues.apache.org/jira/browse/HIVE-24510
>             Project: Hive
>          Issue Type: Improvement
>            Reporter: Mustafa İman
>            Assignee: Mustafa İman
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 4.0.0
>
>          Time Spent: 3h 40m
>  Remaining Estimate: 0h
>
> After https://issues.apache.org/jira/browse/HIVE-23530 , almost all compute stats functions are vectorizable. Only function that is not vectorizable is "compute_bit_vector" for ndv statistics computation. This causes "create table as select" and "insert overwrite select" queries to run in non-vectorized mode. 
> Even a very naive implementation of vectorized compute_bit_vector gives about 50% performance improvement on simple "insert overwrite select" queries. That is because entire mapper or reducer can run in vectorized mode.
>  



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