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https://issues.apache.org/jira/browse/ARROW-5890?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17394073#comment-17394073
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Joris Van den Bossche commented on ARROW-5890:
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Specifically for the {{cast}} case, would we want to have some extension point
in the ExtensionType to control the casting?
> [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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