[ARROW-13855] [C++] [Python] Add support for exporting extension types

• Type: New Feature
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 6.0.0
• Component/s: C++, Python
• Labels: pull-request-available
• External issue URL: https://github.com/apache/arrow/issues/29476
• Assignee: Antoine Pitrou
• Reporter: Jorge Leitão
• Created: 01/Sep/21 21:43
• Updated: 11/Jan/23 08:35
• Resolved: 03/Sep/21 13:45

Description

It would be nice to be able to export extension fields and arrays, i.e.

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)

would not raise

pyarrow.lib.ArrowNotImplementedError: Exporting extension<arrow.py_extension_type<UuidType>> array not supported

Issue Links

• links to: GitHub Pull Request #11071