Liya Fan created ARROW-7019:
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Summary: [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
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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