}
}
// attach an extra node to the solution set delta for the cases where we need to repartition
UnaryOperatorNode solutionSetDeltaUpdateAux = new UnaryOperatorNode("Solution-Set Delta", getSolutionSetKeyFields(),
new SolutionSetDeltaOperator(getSolutionSetKeyFields()));
solutionSetDeltaUpdateAux.setDegreeOfParallelism(getDegreeOfParallelism());
solutionSetDeltaUpdateAux.setSubtasksPerInstance(getSubtasksPerInstance());
PactConnection conn = new PactConnection(solutionSetDelta, solutionSetDeltaUpdateAux);
solutionSetDeltaUpdateAux.setIncomingConnection(conn);