smorken opened a new issue, #42160:
URL: https://github.com/apache/arrow/issues/42160
### Describe the bug, including details regarding any error messages,
version, and platform.
Python 3.12.4 (tags/v3.12.4:8e8a4ba, Jun 6 2024, 19:30:16) [MSC v.1940 64
bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
version: `pyarrow==16.1.0`
the following code produced an unexpected empty table result:
```python
import pyarrow as pa
import pyarrow.parquet as pq
table = pa.table(
{
"_year": [2020, 2022, 2021, 2022, 2019, 2021],
"n_legs": [2, 2, 4, 4, 5, 100],
"animal": ["Flamingo", "Parrot", "Dog", "Horse", "Brittle stars",
"Centipede"],
}
)
pq.write_to_dataset(table, root_path="dataset_v2", partition_cols=["_year"])
dataset = pq.ParquetDataset("dataset_v2/")
print(dataset.read())
```
printed result:
```
pyarrow.Table
----
```
I'm a little unclear on hive partitioning partitioning naming conventions
and rules, and I haven't been able to find any documentation that would say
leading underscores should not work.
I would have expected an error on the dataset creation, if leading
underscores are not supported.
### Component(s)
Parquet
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