Improve messaging around sorted parquet columns for index

[martindurant]

• Tests added / passed
• Passes black dask / flake8 dask

Fixes #5260

[TomAugspurger]

Change "index=kwargs" to index keyword argument? Or at least make clear that it's a single argument, right?

[TomAugspurger]

FYI, you can use match="'cola', 'colb'" now I think, rather than the as record stuff.

I'm not sure whether it asserts that there is just one assertion. But why do we assert that?

[martindurant]

There are other warnings too for pyarrow, so I think it needs to be this way

[TomAugspurger]

I don't think so. I made a small test

import pytest
import warnings


def f(x):
    warnings.warn("test", FutureWarning)
    warnings.warn("user", UserWarning)


def test_foo():
    with pytest.warns(UserWarning, match="user"):
        f(0)

and things seem fine with the match syntax.

[martindurant]

What I mean it, I wanted to capture the recorder object, to explicitly count the number of warnings, and make sure that supplying the kwarg makes that number go down, but doesn't go to zero.

[TomAugspurger]

OK.

[TomAugspurger]

Thanks!