Allow ORDER BY a Function - Mailing list pgsql-hackers

Bruce,

Small correction to the TODO list.    The "allow ORDER BY a function"
feature already exist in 6.4.
   EXAMPLES:
       SELECT foo FROM bar ORDER BY upper(foo);
       -- or any other expression for that matter
       SELECT foo FROM bar ORDER BY  att1 || att2;

It was done as part of the "allow GROUP BY a function" feature.