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https://issues.apache.org/jira/browse/ARROW-3550?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Francois Saint-Jacques reassigned ARROW-3550:
---------------------------------------------

    Assignee: Benjamin Kietzman

> [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
>            Assignee: Benjamin Kietzman
>            Priority: Minor
>              Labels: pull-request-available
>             Fix For: 0.13.0
>
>          Time Spent: 40m
>  Remaining Estimate: 0h
>
> 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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