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https://issues.apache.org/jira/browse/ARROW-8348?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17080522#comment-17080522
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Wes McKinney commented on ARROW-8348:
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I'm not sure about this. It might be useful to set a field in
{{Field::metadata}} to indicate that null values contain a sentinel value that
came from R, so when you convert back you can {{memcpy}} the data over without
having to set the sentinels manually
> [C++] Support optional sentinel values in primitive Array for nulls
> -------------------------------------------------------------------
>
> Key: ARROW-8348
> URL: https://issues.apache.org/jira/browse/ARROW-8348
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++
> Reporter: Francois Saint-Jacques
> Priority: Major
>
> This is an optional feature where a sentinel value is stored in null cells
> and is exposed via an accessor method, e.g. `optional<T>
> Array<T>::HasSentinel() const;`. This would allow zero-copy bi-directional
> conversion with R.
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