Add split_element to convert one element into a few other elements

[iliiliiliili]

Currently, to create new elements from another we can use dataset.transform(lambda x: (x[0], make_P(x[1]), make_R(x[1]), x[2])). This approach breaks dataset names, so we have to call .named(...) after it.
Implementing split_element method that takes name of the (element, function, that returns List with created elements, List[str] of names of new elements) allows us to process the data without the need to touch other data, so less chances for user to make an error.

[LukasHedegaard]

I'm on the verge on this... This functionality may be too specific, and I fear it may just produce unnecessary clutter.

What is your take, @clegaard ?
We recently had a discussion that we might want to split elements across multiple items (not within an item, like here). If we can come up with an intuitive naming scheme and API for the two functionalities, it might be worth pursuing.

[clegaard]

I have implemented this as a an operation subsample, which uses a user-defined function to split each sample.

[LukasHedegaard]

I don't think the thing you have @clegaard implemented is what @iliiliiliili was looking for. You split a sample into multiple samples. @iliiliiliili asked for a method which splits an element in a single sample into multiple elements, e.g. (a,b) -> (a1, a2, b).

[clegaard]

I guess a transform is a right way to go then, only issue is the naming.
I am also on the too specific side on this one, since a transform + named can achieve the same

[LukasHedegaard]

Closing for now