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https://issues.apache.org/jira/browse/ARROW-5225?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17662248#comment-17662248
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Rok Mihevc commented on ARROW-5225:
-----------------------------------
This issue has been migrated to [issue
#21698|https://github.com/apache/arrow/issues/21698] on GitHub. Please see the
[migration documentation|https://github.com/apache/arrow/issues/14542] for
further details.
> [Java] Improve performance of BaseValueVector#getValidityBufferSizeFromCount
> ----------------------------------------------------------------------------
>
> Key: ARROW-5225
> URL: https://issues.apache.org/jira/browse/ARROW-5225
> Project: Apache Arrow
> Issue Type: Improvement
> Components: Java
> Reporter: Ji Liu
> Assignee: Ji Liu
> Priority: Trivial
> Labels: pull-request-available
> Fix For: 0.14.0
>
> Time Spent: 1h 20m
> Remaining Estimate: 0h
>
> Now in _BaseValueVector#getValidityBufferSizeFromCount_ and
> _BitVectorHelper#getValidityBufferSize_, it uses _Math.ceil_ to calculate
> size which is not efficient (lots of unnecessary logic in
> _StrictMath#floorOrCeil_) . Since the valueCount is always not less than 0,
> we could simply replace _Math.ceil_ with the following code:
> _return (valueCount+7) >> 3_;
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