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Aggregate Functions

avg(arg)returns the average value of all tuples in argavg(a.length)
count(arg)returns the number of tuples in argcount(a.ID)
min(arg)returns the minimum value of argmin(a.length)
max(arg)returns the maximum value of argmax(a.length)
sum(arg)returns the sum value of all tuples in argsum(a.length)
collect(arg)returns a list of values returned by arg expressioncollect(a.age)