user: Question: Who had the fastest lap(s) when Stefan Wilson had the pole?
Columns: ['Rd.', 'Race', 'Pole position', 'Fastest lap', 'Most laps led', 'Winning driver', 'Winning team']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['1', 'St. Petersburg', 'Esteban Guerrieri', 'Conor Daly', 'Josef Newgarden', 'Josef Newgarden', 'Sam Schmidt Motorsports']
SQL:

assistant: SELECT "Fastest lap" FROM "Table" WHERE "Pole position" = 'Stefan Wilson';