Animesh Trivedi created ARROW-3891:
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Summary: [Java] Remove Long.bitCount with simple bitmap operations
Key: ARROW-3891
URL: https://issues.apache.org/jira/browse/ARROW-3891
Project: Apache Arrow
Issue Type: Sub-task
Reporter: Animesh Trivedi
Assignee: Animesh Trivedi
the `public int isSet(int index)` routine checks if the bit is set by calling
Long.bitCount function. This is unnecessary and creates performance
degradation. This can simply be replaced by bit shift and bitwise & operation.
`return Long.bitCount(b & (1L << bitIndex));`
to
`return (b >> bitIndex) & 0x01;`
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