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https://issues.apache.org/jira/browse/ARROW-3550?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16655306#comment-16655306
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Wes McKinney commented on ARROW-3550:
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Sounds OK to me. In {{Array::null_count()}}, if the count is unknown and the
validity bitmap is null, then it is set to 0
> [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
> Priority: Minor
>
> 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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