Is the number of metallic spheres the same as the number of metallic cubes?
return spheres ;return #1 that  are metallic  ;return number of  #2 ;return cubes ;return #4 that  are metallic  ;return number of  #5 ;return is  #3 equal to  #6
['select', 'filter', 'aggregate', 'select', 'filter', 'aggregate', 'boolean']