user: Question: who directed the episode that 6.3 million u.s. viewers saw?
Columns: ['No. in series', 'No. in season', 'Title', 'Directed by', 'Written by', 'Original air date', 'Prod. code', 'U.S. viewers (millions)']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['22', '1', '" Walk a Mile in My Pants "', 'Eric Dean Seaton', 'Amy Engelberg & Wendy Engelberg', 'March14,2010', '202', '6.3']
SQL:

assistant: SELECT "Directed by" FROM "Table" WHERE "U.S. viewers (millions)" = '6.3';