user: Question: Who was the director for the film produced by River Films?
Columns: ['Title', 'Director', 'Producer', 'Production Cost', 'Singapore Gross']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['1991', '1991', '1991', '1991', '1991']
SQL:

assistant: SELECT "Director" FROM "Table" WHERE "Producer" = 'River Films';