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https://issues.apache.org/jira/browse/ARROW-2147?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17659175#comment-17659175
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Rok Mihevc commented on ARROW-2147:
-----------------------------------
This issue has been migrated to [issue
#18114|https://github.com/apache/arrow/issues/18114] on GitHub. Please see the
[migration documentation|https://github.com/apache/arrow/issues/14542] for
further details.
> [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 Korn
> Priority: Major
> Labels: pull-request-available
> 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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