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https://issues.apache.org/jira/browse/HIVE-24510?focusedWorklogId=532863&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-532863
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ASF GitHub Bot logged work on HIVE-24510:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 08/Jan/21 06:38
Start Date: 08/Jan/21 06:38
Worklog Time Spent: 10m
Work Description: mustafaiman commented on pull request #1824:
URL: https://github.com/apache/hive/pull/1824#issuecomment-756579677
@abstractdog I had to introduce `compute_bit_vector_hll` and
`compute_bit_vector_fm` because, vectorization is supported only for single
argument functions. compute_bit_vector(arg1, arg2) will not vectorize.
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Issue Time Tracking
-------------------
Worklog Id: (was: 532863)
Time Spent: 1h 40m (was: 1.5h)
> 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: 1h 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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