4. The method of claim 1 , further comprising generating a second call frame associated with the program instruction within the call stack, wherein the second call frame includes a second expression specified by the program instruction, and generating a child frame associated with the second expression within the call stack.
4. The method of claim 1 , further comprising generating a second call frame associated with the program instruction within the call stack, wherein the second call frame includes a second expression specified by the program instruction, and generating a child frame associated with the second expression within the call stack. 5. The method of claim 4 , wherein processing the first expression includes the execution of a database call.