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https://issues.apache.org/jira/browse/ARROW-7019?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Neal Richardson resolved ARROW-7019.
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Fix Version/s: 1.0.0
Resolution: Fixed
Issue resolved by pull request 5751
[https://github.com/apache/arrow/pull/5751]
> [Java] Improve the performance of loading validity buffers
> ----------------------------------------------------------
>
> Key: ARROW-7019
> URL: https://issues.apache.org/jira/browse/ARROW-7019
> Project: Apache Arrow
> Issue Type: Improvement
> Components: Java
> Reporter: Liya Fan
> Assignee: Liya Fan
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.0.0
>
> Time Spent: 1h 10m
> Remaining Estimate: 0h
>
> At the receiver side of flighting, loading validity buffer is an important
> operation, as each vector has a validity buffer.
> For non-nullable vectors, the current implementation of loading the validity
> buffer is inefficient. We improve the performance of this operation by
> efficiently setting the bits of a memory region to 1.
> Benchmark results show that the changes leads to a 35% performance
> improvement:
> Before:
> BitVectorHelperBenchmarks.loadValidityBufferAllOne avgt 5 748.916 ±
> 23.290 ns/op
> After:
> BitVectorHelperBenchmarks.loadValidityBufferAllOne avgt 5 487.352 ±
> 15.046 ns/op
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