If each sailboat sailing in the ocean has three white mainsails.
return sailboats ;return the  ocean ;return #1 sailing in  #2 ;return mainsails of #3 ;return #4 that are white ;return number of  #5 for each  #3 ;return #3 where  #6 is equal to  three ;return number of  #3 ;return number of  #7 ;return if  #9 is equal to  #8
['select', 'select', 'filter', 'project', 'filter', 'group', 'comparative', 'aggregate', 'aggregate', 'boolean']