rename get_column_by_name to col

[MarcoGorelli]

closes #287

[shwina]

I'm +1 to this, but would prefer if we brought this up in the next meeting before merging. Thanks!

[MarcoGorelli]

sure, will wait, thanks

[rgommers]

For context, I think we inherited the get_column_by_name method naming from the interchange protocol. For that protocol, usage is kind of a "one shot" thing, where you may use a few methods when doing a conversion, but it's not like you write a whole library using that API. There is no real reason why we have to keep names that are in the interchange protocol, and get_column_by_name is particularly cumbersome, so +1 to renaming. Any reasonable and ergonomic name works here (.col, .get_col, etc.), so +1 from me.

The one thing to keep in mind for future renames is probably that we should avoid having method names that are also part of the protocol if the semantics are different. But that doesn't seem too likely.

[MarcoGorelli]

approved in today's call too - thanks all, let's get this in and make things happen