[jira] [Closed] (ARROW-11445) Type conversion failure on numpy 0.1.20

["Wes McKinney (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-11445?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Wes McKinney closed ARROW-11445.
--------------------------------

> Type conversion failure on numpy 0.1.20
> ---------------------------------------
>
>                 Key: ARROW-11445
>                 URL: https://issues.apache.org/jira/browse/ARROW-11445
>             Project: Apache Arrow
>          Issue Type: Bug
>          Components: Python
>    Affects Versions: 2.0.0
>         Environment: Python 3.7.4
> Mac OS
>            Reporter: Carlo Mazzaferro
>            Assignee: Uwe Korn
>            Priority: Major
>             Fix For: 3.0.0
>
>
> While I have not dug deep enough in the Arrow codebase, it seems to me that this is caused by the new numpy release: [https://github.com/numpy/numpy/releases] 
> The issue below in fact is not observed when using numpy 0.19.*
>  
>  
>  
> {code:java}
> >>> pandas.__version__, pa.__version__, numpy.__version__
> ('1.2.1', '2.0.0', '1.20.0')
> >>> df = pandas.DataFrame({'a': numpy.random.randn(10), 'b': numpy.random.randn(7).tolist() + [None, pandas.NA, numpy.nan], 'c': list(range(9)) + [numpy.nan]})
> >>> pa.Table.from_pandas(df)
> Traceback (most recent call last):
>   File "<input>", line 1, in <module>
>     pa.Table.from_pandas(df)
>   File "pyarrow/table.pxi", line 1394, in pyarrow.lib.Table.from_pandas
>   File "/Users/carlomazzafero/.virtualenvs/arr/lib/python3.7/site-packages/pyarrow/pandas_compat.py", line 588, in dataframe_to_arrays
>     for c, f in zip(columns_to_convert, convert_fields)]
>   File "/Users/carlomazzafero/.virtualenvs/arr/lib/python3.7/site-packages/pyarrow/pandas_compat.py", line 588, in <listcomp>
>     for c, f in zip(columns_to_convert, convert_fields)]
>   File "/Users/carlomazzafero/.virtualenvs/arr/lib/python3.7/site-packages/pyarrow/pandas_compat.py", line 574, in convert_column
>     raise e
>   File "/Users/carlomazzafero/.virtualenvs/arr/lib/python3.7/site-packages/pyarrow/pandas_compat.py", line 568, in convert_column
>     result = pa.array(col, type=type_, from_pandas=True, safe=safe)
>   File "pyarrow/array.pxi", line 292, in pyarrow.lib.array
>   File "pyarrow/array.pxi", line 79, in pyarrow.lib._ndarray_to_array
>   File "pyarrow/array.pxi", line 67, in pyarrow.lib._ndarray_to_type
>   File "pyarrow/error.pxi", line 107, in pyarrow.lib.check_status
> pyarrow.lib.ArrowTypeError: ('Did not pass numpy.dtype object', 'Conversion failed for column a with type float64')
> {code}



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