[jira] [Created] (ARROW-13677) [C++] Improve performance of unpack64

[Antoine Pitrou (Jira)]

Antoine Pitrou created ARROW-13677:
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             Summary: [C++] Improve performance of unpack64
                 Key: ARROW-13677
                 URL: https://issues.apache.org/jira/browse/ARROW-13677
             Project: Apache Arrow
          Issue Type: Improvement
          Components: C++
            Reporter: Antoine Pitrou


unpack32 benefits from auto-generated SIMD optimizations, but unpack64 doesn't. 
The latter is used by Parquet for DELTA_BINARY_PACKED encoding.



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