message: Add string comparison test
diff: @@ -45,14 +45,21 @@ CREATE TABLE pet (
  statement ok
  insert into pet values ('Oogie','happy'), ('Wilbur', 'quackity-quack'), ('Chorizo', NULL), ('Vacilo', 'beaming')
  -# This actually performs string comparison since they are both ENUMs but of different types.
  +# String Comparison
  +query II
  +select person.name, pet.name from person inner join pet on (person.current_mood > pet.current_mood) where person.name = 'Pedro'
  +----
  +Pedro Vacilo
  +
  +
  +# This actually performs the optimized comparison since they are both ENUMs but of different types.
  +
  query II
  select person.name, pet.name from person inner join pet on (person.current_mood = pet.current_mood)
  ----
  Pedro Oogie
  Hannes Wilbur
  -
  query II
  select person_name,pet_name from
  (select person.name as person_name, pet.name as pet_name, person.current_mood as person_mood, pet.current_mood as pet_mood
  