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https://issues.apache.org/jira/browse/ARROW-1674?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16204763#comment-16204763
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Uwe L. Korn commented on ARROW-1674:
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This is only a hint that the data was initially 8bit but we won't support 8bit
booleans? (My preferred answer would be "yes" here to keep the implementation
of the Arrow spec as simple as possible)
> [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
> Fix For: 0.8.0
>
>
> 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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