[ARROW-7023] [Python] pa.array does not use "from_pandas" semantics for pd.Index

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.16.0
• Component/s: Python
• Labels: pull-request-available
• External issue URL: https://github.com/apache/arrow/issues/23335
• Assignee: Joris Van den Bossche
• Reporter: Joris Van den Bossche
• Created: 29/Oct/19 16:09
• Updated: 11/Jan/23 07:51
• Resolved: 05/Nov/19 13:28

Description

In [15]: idx = pd.Index([1, 2, np.nan], dtype=object)                                                                                                                                                              

In [16]: pa.array(idx)                                                                                                                                                                                             
Out[16]: 
<pyarrow.lib.DoubleArray object at 0x7f2e24300780>
[
  1,
  2,
  nan
]

In [17]: pa.array(idx, from_pandas=True)                                                                                                                                                                           
Out[17]: 
<pyarrow.lib.Int64Array object at 0x7f2e242d3678>
[
  1,
  2,
  null
]

In [18]: pa.array(pd.Series(idx))                                                                                                                                                                                  
Out[18]: 
<pyarrow.lib.Int64Array object at 0x7f2e242d3780>
[
  1,
  2,
  null
]

We should probably handle Series and Index the same in this regard.

Issue Links

• links to: GitHub Pull Request #5753