Sorting by an embedded table's columns is clumsy

[spenczar]

class Parent(Table):
   child = Child.as_column()

class Child(Table):
   x = Int64Column()

Sorting Parent by the values of child.x is not easy. You can't just do t.sort_by('child.x'), since that's not a known field name on Parent.table. So you do a whole sort_indices rigamarole:

class Parent(Table):
    ...
    def sort_by_x(self) -> Self:
        indices = pyarrow.compute.sort_indices(self.child.x)
        return self.take(indices)

This could be improved with a better API.

[spenczar]

Fixed in #54.