Find the movies with the highest average rating. Return the movie titles and average rating.
return movies ;return ratings of  #1 ;return average #2 for each #1 ;return #1 where  #3 is  highest ;return titles of  #4 ;return ratings of  #4 ;return average of  #6 ;return #5 ,   #7
['select', 'project', 'group', 'superlative', 'project', 'project', 'aggregate', 'union']