cyb70289 opened a new pull request #7135:
URL: https://github.com/apache/arrow/pull/7135


   Unaligned bitmap operations are currently calculated bit-by-bit.
   Processing it word-by-word in uint64 improves performance significantly.
   BenchmarkBitmapAnd/32768/1 jumps from 56M/s to 4.1G/s on my test machine.
   
   This patch also improves unit test to cover new code thoroughly.


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