raulcd opened a new pull request, #12797:
URL: https://github.com/apache/arrow/pull/12797
This PR fixes a bug when a list with a single element was used on
`ParquestDataset.read()`.
The following snippet was reported to reproduce the bug:
**Before solution**
```python
In [1]: import pyarrow.parquet as pq
...: import pandas as pd
...: df = pd.DataFrame({'A': [1, 2, 3], 'B': ['a', 'b', 'c']})
...: df.to_parquet('/tmp/test.parquet', index=False)
...: pq.ParquetDataset(['/tmp/test.parquet'],
use_legacy_dataset=False).read(use_threads=False).to_pandas()
---------------------------------------------------------------------------
ValueError Traceback (most recent call last)
ValueError: cannot construct a FileSource from a path without a FileSystem
Exception ignored in: 'pyarrow._dataset._make_file_source'
Traceback (most recent call last):
File "/home/raulcd/open_source/arrow/python/pyarrow/parquet.py", line
1815, in __init__
fragment = parquet_format.make_fragment(single_file, filesystem)
ValueError: cannot construct a FileSource from a path without a FileSystem
---------------------------------------------------------------------------
```
**After solution**
```python
In [1]: import pyarrow.parquet as pq
...: import pandas as pd
...: df = pd.DataFrame({'A': [1, 2, 3], 'B': ['a', 'b', 'c']})
...: df.to_parquet('/tmp/test.parquet', index=False)
...: pq.ParquetDataset(['/tmp/test.parquet'],
use_legacy_dataset=False).read(use_threads=False).to_pandas()
Out[1]:
A B
0 1 a
1 2 b
2 3 c
```
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