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Posted to issues@arrow.apache.org by "Wes McKinney (JIRA)" <ji...@apache.org> on 2018/03/13 02:39:00 UTC
[jira] [Resolved] (ARROW-2142) [Python] Conversion from Numpy
struct array unimplemented
[ https://issues.apache.org/jira/browse/ARROW-2142?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Wes McKinney resolved ARROW-2142.
---------------------------------
Resolution: Fixed
Issue resolved by pull request 1635
[https://github.com/apache/arrow/pull/1635]
> [Python] Conversion from Numpy struct array unimplemented
> ---------------------------------------------------------
>
> Key: ARROW-2142
> URL: https://issues.apache.org/jira/browse/ARROW-2142
> Project: Apache Arrow
> Issue Type: Improvement
> Components: Python
> Affects Versions: 0.8.0
> Reporter: Antoine Pitrou
> Assignee: Antoine Pitrou
> Priority: Major
> Labels: pull-request-available
> Fix For: 0.9.0
>
>
> {code:python}
> >>> arr = np.array([(1.5,)], dtype=np.dtype([('x', np.float32)]))
> >>> arr
> array([(1.5,)], dtype=[('x', '<f4')])
> >>> arr[0]
> (1.5,)
> >>> arr['x']
> array([1.5], dtype=float32)
> >>> arr['x'][0]
> 1.5
> >>> pa.array(arr, type=pa.struct([pa.field('x', pa.float32())]))
> Traceback (most recent call last):
> File "<ipython-input-18-27a52820b7d8>", line 1, in <module>
> pa.array(arr, type=pa.struct([pa.field('x', pa.float32())]))
> File "array.pxi", line 177, in pyarrow.lib.array
> File "error.pxi", line 77, in pyarrow.lib.check_status
> File "error.pxi", line 85, in pyarrow.lib.check_status
> ArrowNotImplementedError: /home/antoine/arrow/cpp/src/arrow/python/numpy_to_arrow.cc:1585 code: converter.Convert()
> NumPyConverter doesn't implement <struct<x: float>> conversion.
> {code}
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