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From https://github.com/apache/arrow/issues/4168. We should add support for pandas' nullable Integer extension dtypes, as those could map nicely to arrows integer types.
Ideally this happens in a generic way though, and not specific for this extension type, which is discussed in ARROW-5271
Support pandas nullable integer type Int64
[Python] Add API to map Arrow types (including extension types) to pandas ExtensionArray instances for to_pandas conversions
[Python] Support protocols to extract Arrow objects from third-party classes
[Python] Interface for converting pandas ExtensionArray / other custom array objects to pyarrow Array