user: Question: Which role did Joemon play before 1991?
Columns: ['Year', 'Movie title', 'Role', 'Direction', 'Screenplay']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [1999.0, 'Pallavur Devanarayanan', 'Pallavur Devanarayana Pothuval', 'V. M. Vinu', 'Gireesh Puthenchery']
SQL:

assistant: SELECT "Role" FROM "Table" WHERE "Year" < 1991.0 AND "Direction" = 'Joemon';