fun getGroupByL(y1: List<Any>, y2: List<Any>): List<NodeTransfer> (source)
Retrieve from the database all nodes n s.t. y1 < n.k_max.y ≤ y2 ∧ (n.k_min.y < y1 ∨ n.k_min.x ≠ n.k_max.x), ordered by ascending level.
This method can only be invoked when the key type is composite, i.e. admits a group and a least significant part.
y1 - the list that identify the minimum element in the range.
y2 - the list that identify the maximum element in the range.
Return
the list of retrieved nodes.