[jira] [Created] (ARROW-4787) [C++] Include "null" values (perhaps with an option to toggle on/off) in hash kernel actions

[Wes McKinney (JIRA)]

Wes McKinney created ARROW-4787:
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             Summary: [C++] Include "null" values (perhaps with an option to 
toggle on/off) in hash kernel actions
                 Key: ARROW-4787
                 URL: https://issues.apache.org/jira/browse/ARROW-4787
             Project: Apache Arrow
          Issue Type: Improvement
          Components: C++
            Reporter: Wes McKinney
             Fix For: 0.14.0


Null is a meaningful value in the context of analytics. We should have the 
option of considering it distinctly in e.g. {{ValueCounts}} 



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