What is the id, name and nationality of the architect who built most mills?
return architects ;return #1 who  built the  most mills ;return the  id of  #2 ;return the  name of  #2 ;return the  nationality of  #2 ;return #3 ,  #4 ,   #5
['select', 'filter', 'project', 'project', 'project', 'union']