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https://issues.apache.org/jira/browse/ARROW-2142?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16389623#comment-16389623
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ASF GitHub Bot commented on ARROW-2142:
---------------------------------------
pitrou commented on issue #1635: ARROW-2142: [Python] Allow conversion from
Numpy struct array
URL: https://github.com/apache/arrow/pull/1635#issuecomment-371155236
Ok, so I fixed the null bitmap offset issue and wrote a large memory test
exercising it.
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> [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
>
> {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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