Wes McKinney created ARROW-1646:
-----------------------------------
Summary: [Python] pyarrow.array cannot handle NumPy scalar types
Key: ARROW-1646
URL: https://issues.apache.org/jira/browse/ARROW-1646
Project: Apache Arrow
Issue Type: Bug
Components: Python
Affects Versions: 0.7.1
Reporter: Wes McKinney
Example repro
{code}
In [1]: import pyarrow as pa
impo
In [2]: import numpy as np
In [3]: pa.array([np.random.randint(0, 10, size=5), None])
---------------------------------------------------------------------------
ArrowInvalid Traceback (most recent call last)
<ipython-input-3-b364fa5d75aa> in <module>()
----> 1 pa.array([np.random.randint(0, 10, size=5), None])
/home/wesm/code/arrow/python/pyarrow/array.pxi in pyarrow.lib.array
(/home/wesm/code/arrow/python/build/temp.linux-x86_64-3.5/lib.cxx:24892)()
171 if mask is not None:
172 raise ValueError("Masks only supported with ndarray-like
inputs")
--> 173 return _sequence_to_array(obj, size, type, pool)
174
175
/home/wesm/code/arrow/python/pyarrow/array.pxi in
pyarrow.lib._sequence_to_array
(/home/wesm/code/arrow/python/build/temp.linux-x86_64-3.5/lib.cxx:23496)()
23 if type is None:
24 with nogil:
---> 25 check_status(ConvertPySequence(sequence, pool, &out))
26 else:
27 if size is None:
/home/wesm/code/arrow/python/pyarrow/error.pxi in pyarrow.lib.check_status
(/home/wesm/code/arrow/python/build/temp.linux-x86_64-3.5/lib.cxx:7876)()
75 message = frombytes(status.message())
76 if status.IsInvalid():
---> 77 raise ArrowInvalid(message)
78 elif status.IsIOError():
79 raise ArrowIOError(message)
ArrowInvalid: /home/wesm/code/arrow/cpp/src/arrow/python/builtin_convert.cc:740
code: InferArrowTypeAndSize(obj, &size, &type)
/home/wesm/code/arrow/cpp/src/arrow/python/builtin_convert.cc:319 code:
InferArrowType(obj, out_type)
/home/wesm/code/arrow/cpp/src/arrow/python/builtin_convert.cc:299 code:
seq_visitor.Visit(obj)
/home/wesm/code/arrow/cpp/src/arrow/python/builtin_convert.cc:180 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}
If these inner values are converted to Python built-in int types then it works
fine
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