Antoine Pitrou created ARROW-2141:
-------------------------------------
Summary: [Python] Conversion from Numpy object array to varsize
binary unimplemented
Key: ARROW-2141
URL: https://issues.apache.org/jira/browse/ARROW-2141
Project: Apache Arrow
Issue Type: Improvement
Components: Python
Affects Versions: 0.8.0
Reporter: Antoine Pitrou
{code:python}
>>> arr = np.array([b'xx'], dtype=np.object)
>>> pa.array(arr, type=pa.binary(2))
<pyarrow.lib.FixedSizeBinaryArray object at 0x7fe1ecaefa98>
[
b'xx'
]
>>> 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
ArrowNotImplementedError:
/home/antoine/arrow/cpp/src/arrow/python/numpy_to_arrow.cc:1585 code:
converter.Convert()
/home/antoine/arrow/cpp/src/arrow/python/numpy_to_arrow.cc:1098 code:
compute::Cast(&context, *arr, type_, options, &casted)
/home/antoine/arrow/cpp/src/arrow/compute/kernels/cast.cc:1022 code: Cast(ctx,
Datum(array.data()), out_type, options, &datum_out)
/home/antoine/arrow/cpp/src/arrow/compute/kernels/cast.cc:1009 code:
GetCastFunction(*value.type(), out_type, options, &func)
No cast implemented from binary to binary
{code}
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