[jira] [Created] (ARROW-8841) [C++] Add benchmark and unittest for PLAIN spaced

[Frank Du (Jira)]

Frank Du created ARROW-8841:
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             Summary: [C++] Add benchmark and unittest for PLAIN spaced 
                 Key: ARROW-8841
                 URL: https://issues.apache.org/jira/browse/ARROW-8841
             Project: Apache Arrow
          Issue Type: Improvement
          Components: C++
            Reporter: Frank Du


Create the benchmark and unittest of PLAIN spaced encoding and decoding for 
future SIMD implementation. Part of 
https://issues.apache.org/jira/browse/ARROW-8579



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