Joris Van den Bossche created ARROW-6176:
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Summary: [Python] Allow to subclass ExtensionArray to attach to
custom extension type
Key: ARROW-6176
URL: https://issues.apache.org/jira/browse/ARROW-6176
Project: Apache Arrow
Issue Type: Improvement
Components: Python
Reporter: Joris Van den Bossche
Currently, you can define a custom extension type in Python with
{code}
class UuidType(pa.ExtensionType):
def __init__(self):
pa.ExtensionType.__init__(self, pa.binary(16))
def __reduce__(self):
return UuidType, ()
{code}
but the array you can create with this is always ExtensionArray. We should
provide a way to define a subclass (eg `UuidArray` in this case) that can hold
custom logic.
For example, a user might want to define `UuidArray` such that `arr[i]` returns
an instance of Python's `uuid.UUID`
>From https://github.com/apache/arrow/pull/4532#pullrequestreview-249396691
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