Return the average total amount purchased and total value purchased for the supplier who supplies the greatest number of products.
return suppliers ;return products that  #1 supply ;return number of  #2 for each #1 ;return #1 where #3 is  the   greatest ;return total  amounts purchased from #4 ;return total  values purchased from #4 ;return the   average of #5 ;return the   average of #6 ;return #7 ,  #8
['select', 'project', 'group', 'comparative', 'project', 'project', 'aggregate', 'aggregate', 'union']