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[jira] [Created] (ARROW-3550) [C++] Use kUnknownNullCount in NumericArray constructor

Wolf Vollprecht created ARROW-3550:

             Summary: [C++] Use kUnknownNullCount in NumericArray constructor
                 Key: ARROW-3550
                 URL: https://issues.apache.org/jira/browse/ARROW-3550
             Project: Apache Arrow
          Issue Type: Improvement
          Components: C++
            Reporter: Wolf Vollprecht

Currently, the default value in the NumericArray constructor for the null_count is 0.

I wonder wether it would be better to use kUnknownNullCount instead? A user could still choose to supply a null_count of 0, or a nullptr as bitmask which would imply a null_count of 0 as well.

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