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https://issues.apache.org/jira/browse/ARROW-5610?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16882059#comment-16882059
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Joris Van den Bossche commented on ARROW-5610:
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> I see. My assumption was that any non-Python extension type used in Python
> would have to be implemented in C++
I think this was indeed the misunderstanding between us in this thread, why we
were talking past each other. I (and I think David as well) was assuming this
issue is about figuring out how to do that _without_ needing to write custom
C++ for each extension type defined in another language.
> [Python] Define extension type API in Python to "receive" or "send" 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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