[
https://issues.apache.org/jira/browse/ARROW-2124?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16361433#comment-16361433
]
ASF GitHub Bot commented on ARROW-2124:
---------------------------------------
wesm commented on issue #1586: ARROW-2124: [Python] Add test for empty item in
array
URL: https://github.com/apache/arrow/pull/1586#issuecomment-365059580
Appveyor build running here
https://ci.appveyor.com/project/xhochy/arrow/build/1.0.572. I will merge once
that advances some more
----------------------------------------------------------------
This is an automated message from the Apache Git Service.
To respond to the message, please log on GitHub and use the
URL above to go to the specific comment.
For queries about this service, please contact Infrastructure at:
us...@infra.apache.org
> [Python] ArrowInvalid raised if the first item of a nested list of numpy
> arrays is empty
> ----------------------------------------------------------------------------------------
>
> Key: ARROW-2124
> URL: https://issues.apache.org/jira/browse/ARROW-2124
> Project: Apache Arrow
> Issue Type: Bug
> Components: Python
> Affects Versions: 0.8.0
> Reporter: George Sakkis
> Assignee: Uwe L. Korn
> Priority: Major
> Labels: pull-request-available
> Fix For: 0.9.0
>
>
> See example below:
> {noformat}
> In [1]: import numpy as np
> In [2]: import pandas as pd
> In [3]: import pyarrow as pa
> In [4]: num_lists = [[2,3,4], [3,6,7,8], [], [2]]
> In [5]: series = pd.Series([np.array(s, dtype=float) for s in num_lists])
> In [6]: pa.array(series)
> Out[6]:
> <pyarrow.lib.ListArray object at 0x7f0db8ad1688>
> [
> [2.0,
> 3.0,
> 4.0],
> [3.0,
> 6.0,
> 7.0,
> 8.0],
> [],
> [2.0]
> ]
> In [7]: num_lists.append([])
> In [8]: series = pd.Series([np.array(s, dtype=float) for s in num_lists])
> In [9]: pa.array(series)
> Out[9]:
> <pyarrow.lib.ListArray object at 0x7f0db8ad1e58>
> [
> [2.0,
> 3.0,
> 4.0],
> [3.0,
> 6.0,
> 7.0,
> 8.0],
> [],
> [2.0],
> []
> ]
> In [10]: num_lists.insert(0, [])
> In [11]: series = pd.Series([np.array(s, dtype=float) for s in num_lists])
> In [12]: pa.array(series)
> ---------------------------------------------------------------------------
> ArrowInvalid Traceback (most recent call last)
> <ipython-input-99-fc3a903278e6> in <module>()
> ----> 1 pa.array(series)
> array.pxi in pyarrow.lib.array()
> array.pxi in pyarrow.lib._ndarray_to_array()
> error.pxi in pyarrow.lib.check_status()
> ArrowInvalid: trying to convert NumPy type object but got float64
> {noformat}
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)
