FastFlow: Efficient Scalable Model-Driven Framework for Processing Massive Mobile Stream Data

Table 3

Query execution plan and related priority scores of different models (the weights of operators are in Box 1).

Query	Execution Plan 1 (optimal)			Execution Plan 2 (normal)
	Plan path	Naïve estimation	Complex estimation	Plan path	Naïve estimation	Complex estimation
Q1	1-5	1.24	1.29	5-1	0.72	0.73
Q2	5-()	0.71	0.66	()-5	0.93	0.60
Q3	4-5-()	1.00	0.99	()-5-4	0.93	0.59