Post-compiling user defined functions

[ritchie46]

This is probably not an easy question. py-polars make extensive use of PyO3 to build a python wrapper around polars. Now I would like to investigate the possibility of letting users compile their own functions against an already compiled cdylib python library.

This issue is a late response to:

David Hewitt
@davidhewitt
Jan 16 08:00
Hmm, that's an interesting question. 
I don't think there's an easy answer, but it should be possible. 
You'll probably need to make users link against the polars extension library? 
Not entirely sure. Want to open an issue and we can figure out a POC?

[davidhewitt]

Thanks. Can you give an example of the kind of API / functionality you would like to expose for users of py-polars?

[ritchie46]

I am not entirely sure what the boundaries of possabilities are but let's say I have a predefined input and output that the user should conform to and between that it may do as it pleases.

fn my_custom_udf(a: &PredefinedType) -> PredefinedType {

    do_some_magic!().into()

}

[davidhewitt]

I see... so if I understand, the problem is related to #1444?

[davidhewitt]

This question has been stale for many months now, so I'm going to close it. Please ping if stil relevant.