Hmmm, not finding this and my experiements are not helping.
I have a join collect that returns the full set of data as expected, but it needs to be sorted in a particular order.
Thought it might be based on PRIMARY, but that's not it. Thought it might be an alphabetical return, that's not it either. Thought it might be based on where the row is sorted in the raw/source sheet, that's not it.
Eg strings:
1 - (abc) - text 1
2 - (xyz) - text 2
It returns though as
2 - (xyz) - text 2
1 - (abc) - text 1