martin-liu commented on PR #13402:
URL: https://github.com/apache/arrow/pull/13402#issuecomment-1163722508
@lidavidm After some debug, it seems like existing code has bug regarding
column names, see below example:
```python
>>> import pandas as pd
>>> import pyarrow as pa
>>> df = pd.DataFrame({0.1: [0.2333], 'a': [0.3444], 3: [0.4555]})
>>> df.columns
Index([0.1, 'a', 3], dtype='object')
>>> pa.Table.from_pandas(df).to_pandas().columns
Index(['0.1', 'a', '3'], dtype='object')
```
I'm not that familiar with the code, but the column names preservation
happens in [this
code](https://github.com/apache/arrow/blob/master/python/pyarrow/pandas_compat.py#L1138)
which seems problematic
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