GitHub issue: `load_dataset` from Hub with `name` to specify `config` using incorrect builder type when multiple data formats are present
Author: hlky (NONE)
State: open | Created: 2024-08-14 18:12:25

Following [documentation](https://huggingface.co/docs/datasets/repository_structure#define-your-splits-and-subsets-in-yaml) I had defined different configs for [`Dataception`](https://huggingface.co/datasets/bigdata-pw/Dataception), a dataset of datasets:

```yaml
configs:
- config_name: dataception
  data_files:
  - path: dataception.parquet
    split: train
  default: true
- config_name: dataset_5423
  data_files:
  - path: datasets/5423.tar
    split: train
...
- config_name: dataset_721736
  data_files:
  - path: datasets/721736.tar
    split: train
```

The intent was for metadata to be browsable via Dataset Viewer, in addition to each individual dataset, and to allow datasets to be loaded by specifying the config/name to `load_dataset`.

While testing `load_dataset` I encountered the following error:

```python
>>> dataset = load_dataset("bigdata-pw/Dataception", "dataset_7691")
Downloading readme: 100%|████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████| 467k/467k [00:00<00:00, 1.99MB/s]
Downloading data: 100%|████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████| 71.0M/71.0M [00:02<00:00, 26.8MB/s]
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "datasets\load.py", line 2145, in load_dataset
    builder_instance.download_and_prepare(
  File "datasets\builder.py", line 1027, in download_and_prepare
    self._download_and_prepare(
  File "datasets\builder.py", line 1100, in _download_and_prepare
    split_generators = self._split_generators(dl_manager, **split_generators_kwargs)
                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "datasets\packaged_modules\parquet\parquet.py", line 58, in _split_generators
    self.info.features = datasets.Features.from_arrow_schema(pq.read_schema(f))
                                                             ^^^^^^^^^^^^^^^^^
  File "pyarrow\parquet\core.py", line 2325, in read_schema
    file = ParquetFile(
           ^^^^^^^^^^^^
  File "pyarrow\parquet\core.py", line 318, in __init__
    self.reader.open(
  File "pyarrow\_parquet.pyx", line 1470, in pyarrow._parquet.ParquetReader.open
  File "pyarrow\error.pxi", line 91, in pyarrow.lib.check_status
pyarrow.lib.ArrowInvalid: Parquet magic bytes not found in footer. Either the file is corrupted or this is not a parquet file.
```

The correct file is downloaded, however the incorrect builder type is detected; `parquet` due to other content of the repository. It would appear that the config needs to be taken into account.

Note that I have removed the additional configs from the repository because of this issue and there is a limit of 3000 configs anyway so the Dataset Viewer doesn't work as I intended. I'll add them back in if it assists with testing.