Task: Question Decomposition
Input (English): question: Show the minimum, average, maximum order quantity of all invoices.
Output (English): #1 return all invoices 
#2 return order quantities of  #1 
#3 return minimum of  #2 
#4 return maximum of  #2 
#5 return average of  #2 
#6 return #3 ,   #4 ,  #5