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https://issues.apache.org/jira/browse/ARROW-7216?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated ARROW-7216:
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Labels: pull-request-available (was: )
> [Java] Improve the performance of setting/clearing individual bits
> ------------------------------------------------------------------
>
> Key: ARROW-7216
> URL: https://issues.apache.org/jira/browse/ARROW-7216
> Project: Apache Arrow
> Issue Type: Improvement
> Components: Java
> Reporter: Liya Fan
> Assignee: Liya Fan
> Priority: Major
> Labels: pull-request-available
>
> Setting/clearing individual bits are key operations for Arrow. In this issue,
> we improve the performance these operations by:
> 1. replacing arithmetic operations with bit-wise operations
> 2. remove unnecessary casts between int/byte
> 3. provide new API to remove the if branch
> Benchmark results show that for clearing a bit, the performance improve by
> 11%, and for general set/clear operation, the performance improve by 4.7%:
> before:
> BitVectorHelperBenchmarks.setValidityBitBenchmark avgt 5 4.524 ±
> 0.015 us/op
> after:
> BitVectorHelperBenchmarks.setValidityBitBenchmark avgt 5 4.313 ±
> 0.011 us/op
> BitVectorHelperBenchmarks.setValidityBitToZeroBenchmark avgt 5 4.020 ±
> 0.016 us/op
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