[jira] [Created] (ARROW-2142) [Python] Conversion from Numpy struct array unimplemented

["Antoine Pitrou (JIRA)" <ji...@apache.org>]

Antoine Pitrou created ARROW-2142:
-------------------------------------

             Summary: [Python] Conversion from Numpy struct array unimplemented
                 Key: ARROW-2142
                 URL: https://issues.apache.org/jira/browse/ARROW-2142
             Project: Apache Arrow
          Issue Type: Improvement
          Components: Python
    Affects Versions: 0.8.0
            Reporter: Antoine Pitrou


{code:python}
>>> arr = np.array([(1.5,)], dtype=np.dtype([('x', np.float32)]))
>>> arr
array([(1.5,)], dtype=[('x', '<f4')])
>>> arr[0]
(1.5,)
>>> arr['x']
array([1.5], dtype=float32)
>>> arr['x'][0]
1.5
>>> pa.array(arr, type=pa.struct([pa.field('x', pa.float32())]))
Traceback (most recent call last):
  File "<ipython-input-18-27a52820b7d8>", line 1, in <module>
    pa.array(arr, type=pa.struct([pa.field('x', pa.float32())]))
  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
ArrowNotImplementedError: /home/antoine/arrow/cpp/src/arrow/python/numpy_to_arrow.cc:1585 code: converter.Convert()
NumPyConverter doesn't implement <struct<x: float>> conversion.
{code}



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