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https://issues.apache.org/jira/browse/ARROW-6897?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Antoine Pitrou closed ARROW-6897.
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    Resolution: Not A Bug

Judging by the PR discussion, this was based on a misunderstanding about the 
meaning of an absent null bitmap (basically, the null bitmap is allowed to be 
omitted when all entries are valid). Closing.

> [C++] Fix MakeArrayFromScalar function validity buffer is null bug
> ------------------------------------------------------------------
>
>                 Key: ARROW-6897
>                 URL: https://issues.apache.org/jira/browse/ARROW-6897
>             Project: Apache Arrow
>          Issue Type: Bug
>          Components: C++
>            Reporter: Chendi.Xue
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 1h
>  Remaining Estimate: 0h
>
> Noticed this bug when I want to create Array from scalar, original codes will 
> set null_buf as nullptr, which made this created array invalid.



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