[jira] [Commented] (ARROW-5890) [C++][Python] Support ExtensionType arrays in more kernels

["Clark Zinzow (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ARROW-5890?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17573106#comment-17573106 ] 

Clark Zinzow commented on ARROW-5890:
-------------------------------------

Does allowing extension type implementers to register a cast function sound reasonable? I might be able to take a stab at this (just casting) in the coming months.

> [C++][Python] Support ExtensionType arrays in more kernels
> ----------------------------------------------------------
>
>                 Key: ARROW-5890
>                 URL: https://issues.apache.org/jira/browse/ARROW-5890
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: C++
>            Reporter: Joris Van den Bossche
>            Priority: Major
>
> From a quick test (through Python), it seems that {{slice}} and {{take}} work, but the following not:
> - {{cast}}: it could rely on the casting rules for the storage type. Or do we want that you explicitly have to take the storage array before casting?
> - {{dictionary_encode}} / {{unique}}



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