Aggregate Functions

Function	Description	Example
avg(arg)	returns the average value of all tuples in arg	avg(a.length)
count(arg)	returns the number of tuples in arg	count(a.ID)
min(arg)	returns the minimum value of arg	min(a.length)
max(arg)	returns the maximum value of arg	max(a.length)
sum(arg)	returns the sum value of all tuples in arg	sum(a.length)
collect(arg)	returns a list of values returned by arg expression	collect(a.age)