Antoine Pitrou created ARROW-6032:
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             Summary: [C++] CountSetBits doesn't ensure 64-bit aligned accesses
                 Key: ARROW-6032
                 URL: https://issues.apache.org/jira/browse/ARROW-6032
             Project: Apache Arrow
          Issue Type: Bug
          Components: C++
    Affects Versions: 0.14.1
            Reporter: Antoine Pitrou


If the {{data}} pointer isn't 64-bit aligned, then {{CountSetBits}} fails to 
ensure 64-bit aligned accesses in the 64-bit popcnt loop.



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