@stalbert Well, not exactly, but it may be possible in some scenarios. If, for example, x.y and a.b are both fields referring to the same List/Record, then you can join x.y to that Record type, and then join a.b to that record type, which I think will work. If, on the other hand, they are just text or number field that happen to have the same value, then no, I don't think there is any syntax to allow that kind of join yet.