Liya Fan created ARROW-5843:
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Summary: [Java] Improve the readability and performance of
BitVectorHelper#getNullCount
Key: ARROW-5843
URL: https://issues.apache.org/jira/browse/ARROW-5843
Project: Apache Arrow
Issue Type: Improvement
Components: Java
Reporter: Liya Fan
Assignee: Liya Fan
Improve the performance by:
1. Count the number of 1 bits by long or int, instead of by byte
2. If the number of value count is a multiple of 8, there is no need to process
the last byte separately. This makes the code clearer.
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