cyb70289 opened a new pull request #7340:
URL: https://github.com/apache/arrow/pull/7340


   This patch adds word based bitmap reader/writer class to hold common
   code in unaligned bitmap operations(copy, compare, logical).
   
   It processes in words, then bytes, and finally in bits. Bitmap copying
   improves about 5% ~ 10% performance. Slight drop(2% ~ 5%) for bitmap
   comparing. No obvious difference for logical operations.


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