Antoine Pitrou created ARROW-2147:
-------------------------------------
Summary: [Python] Type inference doesn't work on lists of Numpy
arrays
Key: ARROW-2147
URL: https://issues.apache.org/jira/browse/ARROW-2147
Project: Apache Arrow
Issue Type: Improvement
Components: Python
Affects Versions: 0.8.0
Reporter: Antoine Pitrou
{code:python}
>>> arr = np.int16([2, 3, 4])
>>> pa.array(arr)
<pyarrow.lib.Int16Array object at 0x7f939f30a0e8>
[
2,
3,
4
]
>>> pa.array([arr])
Traceback (most recent call last):
File "<ipython-input-6-254285212203>", line 1, in <module>
pa.array([arr])
File "array.pxi", line 181, in pyarrow.lib.array
File "array.pxi", line 26, in pyarrow.lib._sequence_to_array
File "error.pxi", line 77, in pyarrow.lib.check_status
ArrowInvalid: /home/antoine/arrow/cpp/src/arrow/python/builtin_convert.cc:964
code: InferArrowType(seq, &real_type)
/home/antoine/arrow/cpp/src/arrow/python/builtin_convert.cc:321 code:
seq_visitor.Visit(obj)
/home/antoine/arrow/cpp/src/arrow/python/builtin_convert.cc:195 code:
VisitElem(ref, level)
Error inferring Arrow data type for collection of Python objects. Got Python
object of type ndarray but can only handle these types: bool, float, integer,
date, datetime, bytes, unicode
{code}
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