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https://issues.apache.org/jira/browse/HIVE-24510?focusedWorklogId=522963&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-522963
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ASF GitHub Bot logged work on HIVE-24510:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 11/Dec/20 01:38
Start Date: 11/Dec/20 01:38
Worklog Time Spent: 10m
Work Description: mustafaiman opened a new pull request #1764:
URL: https://github.com/apache/hive/pull/1764
I organized this pull request in 3 commits for ease of review.
First commit adds a test that prints hex(compute_bit_vector(col)) for some
tables. So we can use that as the source of truth for testing vectorized
function.
Second commit is the actual implementation.
Third commit is the q.out file changes.
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Issue Time Tracking
-------------------
Worklog Id: (was: 522963)
Remaining Estimate: 0h
Time Spent: 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
> Time Spent: 10m
> 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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