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https://issues.apache.org/jira/browse/ARROW-2037?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16858688#comment-16858688
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Joris Van den Bossche commented on ARROW-2037:
----------------------------------------------
Not fully sure what is left to do here. The referenced issue ARROW-1941 was
closed by https://github.com/apache/arrow/pull/1449, which included a test for
roundtrip of columns with empty lists.
Unless it is not related to that issue? Because the example of ARROW-1941
(column of empty lists) does not given an inferred type of 'empty' but 'mixed':
{code:python}
In [22]: empty_list_array = np.empty((3,), dtype=object)
...: empty_list_array.fill([])
...:
...: df = pd.DataFrame({'a': np.array(['1', '2', '3']),
...: 'b': empty_list_array})
In [23]: df
Out[23]:
a b
0 1 []
1 2 []
2 3 []
In [25]: pd.api.types.infer_dtype(df['b'], skipna=True)
Out[25]: 'mixed'
{code}
> [Python]: Add tests for ARROW-1941 cases where pandas inferred type is 'empty'
> ------------------------------------------------------------------------------
>
> Key: ARROW-2037
> URL: https://issues.apache.org/jira/browse/ARROW-2037
> Project: Apache Arrow
> Issue Type: Bug
> Components: Python
> Affects Versions: 0.8.0
> Reporter: Phillip Cloud
> Assignee: Phillip Cloud
> Priority: Major
> Fix For: 0.14.0
>
>
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