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https://issues.apache.org/jira/browse/ARROW-5705?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Micah Kornfield resolved ARROW-5705.
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Resolution: Fixed
Fix Version/s: 0.14.0
Issue resolved by pull request 4671
[https://github.com/apache/arrow/pull/4671]
> [Java] Optimize BaseValueVector#computeCombinedBufferSize logic
> ---------------------------------------------------------------
>
> Key: ARROW-5705
> URL: https://issues.apache.org/jira/browse/ARROW-5705
> Project: Apache Arrow
> Issue Type: Improvement
> Components: Java
> Reporter: Ji Liu
> Assignee: Ji Liu
> Priority: Minor
> Labels: pull-request-available
> Fix For: 0.14.0
>
> Time Spent: 4h 20m
> Remaining Estimate: 0h
>
> Now in BaseValueVector#computeCombinedBufferSize, it computes validity buffer
> size as follow:
> _roundUp8(getValidityBufferSizeFromCount(valueCount))_
> which can be be expanded to
> _(((valueCount + 7) >> 3 + 7) / 8) * 8_
> Seems there's no need to compute bufferSize first and expression above could
> be replaced with:
> _(valueCount + 63) / 64 * 8_
> In this way, performance of _computeCombinedBufferSize_ would be improved.
> Performance test:
> Before:
> BaseValueVectorBenchmarks.testC_omputeCombinedBufferSize_ avgt 5 4083.180 ±
> 180.363 ns/op
> After:
> BaseValueVectorBenchmarks.testC_omputeCombinedBufferSize_ avgt 5 3808.635 ±
> 162.347 ns/op
>
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