Sequence of three transformations (T1, T2, and T3), implemented by table functions. Each transformation is performed by a single table function. Output from all but the final one is materialized and staged before being passed to the next transformation.
OLTP database structure points to T1
T1 points to Stage 1
Stage 1 points to T2
T2 points to Stage 2
Stage 2 points to T3
T3 points to DSS database structure