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  1. Apache Arrow
  2. ARROW-13855

[C++] [Python] Add support for exporting extension types

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      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
      

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              apitrou Antoine Pitrou
              jorgecarleitao Jorge Leitão
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