user: Question: what is the highest rank for director John Woo?
Columns: ['Rank', 'Title', 'Studio', 'Director', 'Worldwide Gross']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'Titanic', 'Paramount / 20th Century Fox', 'James Cameron', '$1,843,201,268']
SQL:

assistant: SELECT MAX("Rank") FROM "Table" WHERE "Director" = 'John Woo';