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https://issues.apache.org/jira/browse/ARROW-5610?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16867170#comment-16867170
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Wes McKinney commented on ARROW-5610:
-------------------------------------

Given everything else needed for the release, I moved this to the 1.0.0 
milestone

> [Python] Define extension type API in Python to "receive" a foreign extension 
> type
> ----------------------------------------------------------------------------------
>
>                 Key: ARROW-5610
>                 URL: https://issues.apache.org/jira/browse/ARROW-5610
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: Python
>            Reporter: Wes McKinney
>            Priority: Major
>             Fix For: 1.0.0
>
>
> In work in ARROW-840, a static {{arrow.py_extension_type}} name is used. 
> There will be cases where an extension type is coming from another 
> programming language (e.g. Java), so it would be useful to be able to "plug 
> in" a Python extension type subclass that will be used to deserialize the 
> extension type coming over the wire. This has some different API requirements 
> since the serialized representation of the type will not have knowledge of 
> Python pickling, etc. 



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