Can't get column from ParquetFile schema using PyArrow

### Describe the bug, including details regarding any error messages, version, and platform.

Consider this code

```python
import pandas as pd
from pyarrow.parquet import ParquetFile

df = pd.DataFrame({"a": [1], "b": [2]})
df.to_parquet('/tmp/test.parquet')
f = ParquetFile('/tmp/test.parquet')
f.schema.column('a')
```

Using Python 3.8, pyarrow 11.0.0 and pandas 1.5.3, I get the following error from the last line:

```
Traceback (most recent call last):
File "", line 1, in
File "pyarrow/_parquet.pyx", line 907, in pyarrow._parquet.ParquetSchema.column
TypeError: '<' not supported between instances of 'str' and 'int'
```

### Component(s)

Python