[jira] [Assigned] (ARROW-2147) [Python] Type inference doesn't work on lists of Numpy arrays

["Uwe L. Korn (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-2147?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Uwe L. Korn reassigned ARROW-2147:
----------------------------------

    Assignee: Uwe L. Korn

> [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
>            Assignee: Uwe L. Korn
>            Priority: Major
>             Fix For: 0.10.0
>
>
> {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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