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Posted to issues@hive.apache.org by "ASF GitHub Bot (Jira)" <ji...@apache.org> on 2021/01/04 13:28:00 UTC
[jira] [Work logged] (HIVE-24510) Vectorize compute_bit_vector
[ https://issues.apache.org/jira/browse/HIVE-24510?focusedWorklogId=530657&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-530657 ]
ASF GitHub Bot logged work on HIVE-24510:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 04/Jan/21 13:27
Start Date: 04/Jan/21 13:27
Worklog Time Spent: 10m
Work Description: mustafaiman closed pull request #1764:
URL: https://github.com/apache/hive/pull/1764
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Issue Time Tracking
-------------------
Worklog Id: (was: 530657)
Time Spent: 20m (was: 10m)
> 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
> Time Spent: 20m
> 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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