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https://issues.apache.org/jira/browse/ARROW-1674?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17393393#comment-17393393
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Weston Pace commented on ARROW-1674:
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Yes, it is still needed for zero-copy compatibility with numpy which can be
useful in a few situations.
> [C++] Add ExtensionType implementation for 8-bit boolean values
> ---------------------------------------------------------------
>
> Key: ARROW-1674
> URL: https://issues.apache.org/jira/browse/ARROW-1674
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++
> Reporter: Wes McKinney
> Priority: Major
> Labels: pull-request-available
>
> Some libraries (e.g. NumPy) represent boolean values using an array of int8
> or uint8 values of 1's and 0's. This can present a challenge at times to
> receive such memory without copying.
> Now that we have ExtensionType capabilities, we could define an extension
> type distinguish UInt8/Int8-annotated-as-boolean to be able to flow through
> such data in applications.
> A discussion about introducing a new logical type didn't go anywhere, so
> having a custom container that can be used for these specialized applications
> is one way to unblock the use case. If we develop some endogenous use of such
> data in C++, we would need to be mindful to sanitize it to bitpacked boolean
> before sending to another Arrow application
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