'sort' method sorts one column only
Hi ! `ds.sort()` does sort the full dataset, not just one column:
```python
from datasets import *

ds = Dataset.from_dict({"foo": [3, 2, 1], "bar": ["c", "b", "a"]})
print(d.sort("foo").to_pandas()
#    foo bar
# 0    1   a
# 1    2   b
# 2    3   c
```

What made you think it was not the case ? Did you experience a situation where it was only sorting one column ? Hi! thank you for your quick reply!
I wanted to sort the `cnn_dailymail` dataset by the length of the labels (num of characters). I added a new column to the dataset (`ds.add_column`) with the lengths and then sorted by this new column. Only the new length column was sorted, the reset left in their original order.  That's unexpected, can you share the code you used to get this ?
The 'sort' method changes the order of one column only (the one defined by the argument 'column'), thus creating a mismatch between a sample fields. I would expect it to change the order of the samples as a whole, based on the 'column' order.