On traces of #33982

[kuraga]

To pay attention on #33982 (comment). Sorry, I don't know another way now.

/cc @mproszewska , @jreback

Thanks.

[WillAyd]

Can you clarify what this is for? I didn't understand from the comment linked

[kuraga]

@WillAyd , #33982 introduces index_col argument in _is_potential_multi_index:

- def _is_potential_multi_index(columns):
+ def _is_potential_multi_index(
+     columns, index_col: Optional[Union[bool, Sequence[int]]] = None
+ ):

There are two usages of this function in Pandas:

1. https://github.com/pandas-dev/pandas/blob/v1.0.5/pandas/io/parsers.py#L1526
2. https://github.com/pandas-dev/pandas/blob/v1.0.5/pandas/io/parsers.py#L1547

#33982 modifies first call only. In that comment I ask if it is correct.

[alimcmaster1]

@kuraga - might be worth adding a test to highlight what functionality this changes?

[WillAyd]

Closing as its not clear what this is or solves; if you can clarify further and add a test case can certainly reopen

[kuraga]

@WillAyd , it solves nothing. It demonstrates #33982 (comment)

[jreback]

@kuraga ia this actually a bug?

iow can u hit the line of code u added?