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https://issues.apache.org/jira/browse/ARROW-1674?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16682615#comment-16682615
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Wes McKinney commented on ARROW-1674:
-------------------------------------
I think we should probably define a metadata annotation for uint8/int8 to
indicate that the data is semantically boolean. This will enable numpy.bool_ to
be roundtrippped more gracefully
> [Format] Add bit width metadata to Bool logical type
> ----------------------------------------------------
>
> Key: ARROW-1674
> URL: https://issues.apache.org/jira/browse/ARROW-1674
> Project: Apache Arrow
> Issue Type: Improvement
> Components: Format
> Reporter: Wes McKinney
> Priority: Major
> Labels: pull-request-available
>
> Some libraries represent boolean data as a single byte per value as a vector
> of int8/uint8 1's and 0's. It would be useful to be able to retain this
> metadata as an optional field on the {{Bool}} table in {{Schema.fbs}}
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