[jira] [Created] (ARROW-1572) [C++] Implement "value counts" kernels for tabulating value frequencies

[Wes McKinney (JIRA)]

Wes McKinney created ARROW-1572:
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             Summary: [C++] Implement "value counts" kernels for tabulating 
value frequencies
                 Key: ARROW-1572
                 URL: https://issues.apache.org/jira/browse/ARROW-1572
             Project: Apache Arrow
          Issue Type: New Feature
          Components: C++
            Reporter: Wes McKinney


This is related to "match", "isin", and "unique" since hashing is generally 
required



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