How many international and domestic passengers are there in the airport London Heathrow?
return airports ;return passengers of  #1 ;return #2 where  #1 is London Heathrow ;return #3 that  are  international ;return number of  #4 ;return #3 that  are  domestic ;return number of  #6 ;return sum of  #5 and #6
['select', 'project', 'comparative', 'filter', 'aggregate', 'filter', 'aggregate', 'arithmetic']