12. The computing system of claim 11 , wherein the middleware comprises a second component to extend functionality of the database engine to support the functional-form query that expresses the dataflow graph.
12. The computing system of claim 11 , wherein the middleware comprises a second component to extend functionality of the database engine to support the functional-form query that expresses the dataflow graph. 15. The computing system of claim 12 , wherein the second component is to provide for dataflow during evaluation of the functional-form query by passing references to objects of the functional-form query without duplicating the objects.