[jira] [Updated] (ARROW-13855) [C++] [Python] Add support for exporting extension types

["Jorge Leitão (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-13855?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jorge Leitão updated ARROW-13855:
---------------------------------
    Summary: [C++] [Python] Add support for exporting extension types  (was: [C++] [PYthon] Add support for exporting extension types)

> [C++] [Python] Add support for exporting extension types
> --------------------------------------------------------
>
>                 Key: ARROW-13855
>                 URL: https://issues.apache.org/jira/browse/ARROW-13855
>             Project: Apache Arrow
>          Issue Type: New Feature
>          Components: C++, Python
>            Reporter: Jorge Leitão
>            Priority: Major
>
> It would be nice to be able to export extension fields and arrays, i.e.
> {code:python}
> import pyarrow
> class UuidType(pyarrow.PyExtensionType):
>     def __init__(self):
>         super().__init__(pyarrow.binary(16))
>     def __reduce__(self):
>         return UuidType, ()
> field = pyarrow.field("aa", UuidType())
> field._export_to_c(pointer)
> {code}
> would not raise
> {code:java}
> pyarrow.lib.ArrowNotImplementedError: Exporting extension<arrow.py_extension_type<UuidType>> array not supported
> {code}



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