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https://issues.apache.org/jira/browse/ARROW-16048?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17513483#comment-17513483
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Antoine Pitrou commented on ARROW-16048:
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Hmm, best would perhaps be to have a dedicated {{NullBuffer}} class so that
they can be recreated faithfully when unpickling?
> [PyArrow] Null buffers with Pickle protocol.
> --------------------------------------------
>
> Key: ARROW-16048
> URL: https://issues.apache.org/jira/browse/ARROW-16048
> Project: Apache Arrow
> Issue Type: Bug
> Components: Python
> Reporter: Micah Kornfield
> Assignee: Micah Kornfield
> Priority: Minor
>
> When underlying buffers are null they populate the buffer protocol ".buf"
> value with a null value. In some cases this can violate contracts [asserted
> in
> cpython|https://github.com/python/cpython/blob/882d8096c262a5945e0cfdd706e5db3ad2b73543/Modules/_pickle.c#L1072].
> It might be best to always return an empty non-null buffer when the
> underlying buffer is null.
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