user: Question: When 1008/1009 is the production code how many directors are there?
Columns: ['No. in series', 'Title', 'Directed By', 'Written By', 'air date', 'Production code']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['1', '"A Harvest of Friends"', 'Michael Landon', 'Blanche Hanalis , John Hawkins & William Putman', 'September 11, 1974', '1002']
SQL:

assistant: SELECT COUNT("Directed By") FROM "Table" WHERE "Production code" = '1008/1009';