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Posted to issues@arrow.apache.org by "ASF GitHub Bot (JIRA)" <ji...@apache.org> on 2018/04/18 09:42:00 UTC
[jira] [Commented] (ARROW-2147) [Python] Type inference doesn't
work on lists of Numpy arrays
[ https://issues.apache.org/jira/browse/ARROW-2147?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16442188#comment-16442188 ]
ASF GitHub Bot commented on ARROW-2147:
---------------------------------------
xhochy commented on a change in pull request #1908: ARROW-2147: [Python] Fix type inference of numpy arrays
URL: https://github.com/apache/arrow/pull/1908#discussion_r182368285
##########
File path: python/pyarrow/tests/test_parquet.py
##########
@@ -813,6 +813,9 @@ def _check_roundtrip(table, expected=None, **params):
result = _roundtrip_table(table, **params)
assert result.equals(expected)
+ result = _roundtrip_table(result, **params)
Review comment:
No issue with 0.9 but the second rountrip failed on 0.8
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> [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
> 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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