[jira] [Updated] (ARROW-1674) [C++] Add ExtensionType implementation for 8-bit boolean values

["Eduardo Ponce (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-1674?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Eduardo Ponce updated ARROW-1674:
---------------------------------
    Labels: good-second-issue pull-request-available  (was: pull-request-available)

> [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: good-second-issue, 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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