Antoine Pitrou created ARROW-2141:

             Summary: [Python] Conversion from Numpy object array to varsize 
binary unimplemented
                 Key: ARROW-2141
             Project: Apache Arrow
          Issue Type: Improvement
          Components: Python
    Affects Versions: 0.8.0
            Reporter: Antoine Pitrou

>>> arr = np.array([b'xx'], dtype=np.object)
>>> pa.array(arr, type=pa.binary(2))
<pyarrow.lib.FixedSizeBinaryArray object at 0x7fe1ecaefa98>
>>> pa.array(arr, type=pa.binary())
Traceback (most recent call last):
  File "<ipython-input-12-e40948b94b33>", line 1, in <module>
    pa.array(arr, type=pa.binary())
  File "array.pxi", line 177, in pyarrow.lib.array
  File "error.pxi", line 77, in pyarrow.lib.check_status
  File "error.pxi", line 85, in pyarrow.lib.check_status
/home/antoine/arrow/cpp/src/arrow/python/ code: 
/home/antoine/arrow/cpp/src/arrow/python/ code: 
compute::Cast(&context, *arr, type_, options, &casted)
/home/antoine/arrow/cpp/src/arrow/compute/kernels/ code: Cast(ctx, 
Datum(, out_type, options, &datum_out)
/home/antoine/arrow/cpp/src/arrow/compute/kernels/ code: 
GetCastFunction(*value.type(), out_type, options, &func)
No cast implemented from binary to binary

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