If there is one dog standing in the grass and one dog sitting on carpet.
return dogs ;return grass ;return carpet ;return #1 that is sitting in  #2 ;return #1 that is sitting on #3 ;return number of  #4 ;return number of  #5 ;return if  #6 is equal to  one ;return if  #7 is equal to  one ;return if  both  #8 and #9 are true
['select', 'select', 'select', 'filter', 'filter', 'aggregate', 'aggregate', 'boolean', 'boolean', 'boolean']