1. A computing system comprising: hardware; a database engine implemented by the hardware; and, middleware integrated within the database engine and implemented by the hardware to execute a functional-form query representing a dataflow graph comprising a plurality of queries and a plurality of relation valued functions, wherein the middleware is to interact with the database engine to cause the database engine to execute the queries, and wherein each relation valued function receives a plurality of first relations as input and generates a second relation as output.
1. A computing system comprising: hardware; a database engine implemented by the hardware; and, middleware integrated within the database engine and implemented by the hardware to execute a functional-form query representing a dataflow graph comprising a plurality of queries and a plurality of relation valued functions, wherein the middleware is to interact with the database engine to cause the database engine to execute the queries, and wherein each relation valued function receives a plurality of first relations as input and generates a second relation as output. 5. The computing system of claim 1 , wherein each relation valued function defines a function to generate the second relation from the first relations.