Not able to load the pile
### Describe the bug

Got this error when I am trying to load the pile dataset 

```
TypeError: Couldn't cast array of type
struct<file: string, id: string>
to
{'id': Value(dtype='string', id=None)}

```


### Steps to reproduce the bug

Please visit the following sample notebook 

https://colab.research.google.com/drive/1JHcjawcHL6QHhi5VcqYd07W2QCEj2nWK#scrollTo=ulJP3eJCI-tB

### Expected behavior

The pile should work

### Environment info

-  `datasets` version: 2.11.0
- Platform: Linux-5.10.147+-x86_64-with-glibc2.31
- Python version: 3.9.16
- Huggingface_hub version: 0.13.4
- PyArrow version: 9.0.0
- Pandas version: 1.5.3