[jira] [Created] (ARROW-2244) [C++] Slicing NullArray should not cause the null count on the internal data to be unknown

[Wes McKinney (JIRA)]

Wes McKinney created ARROW-2244:
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             Summary: [C++] Slicing NullArray should not cause the null count 
on the internal data to be unknown
                 Key: ARROW-2244
                 URL: https://issues.apache.org/jira/browse/ARROW-2244
             Project: Apache Arrow
          Issue Type: Improvement
          Components: C++
            Reporter: Wes McKinney
             Fix For: 0.9.0


see https://github.com/apache/arrow/blob/master/cpp/src/arrow/array.cc#L101



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