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[jira] [Created] (ARROW-3922) improve the performance of bitmap operations

Animesh Trivedi created ARROW-3922:

             Summary: improve the performance of bitmap operations
                 Key: ARROW-3922
                 URL: https://issues.apache.org/jira/browse/ARROW-3922
             Project: Apache Arrow
          Issue Type: Improvement
            Reporter: Animesh Trivedi
            Assignee: Animesh Trivedi

C++ bitmap code can be optimized further by using the unsigned integers than "int64_t" for bitmap checks, and eliminating the kBitmap. See here [https://godbolt.org/z/deq0_q] - compare the size of the assembly code. And the performance measurements in the blog show up to 50% performance gains. 
Alternatively if signed to unsigned upgrade is not possible (perhaps in every language), then in the C++ code, we should use the bitmap operations directory ( `<<3` for division by 8, and ` & 0x7` for modulo by 8 operation), instead of `/` and `%`. 

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