user: Question: Who was the race 1 winner of the race at Hidden Valley Raceway?
Columns: ['Event', 'Circuit', 'Date', 'Pole Position', 'Race 1 Winner', 'Race 2 Winner', 'Race 3 Winner']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'Albert Park Street Circuit', '28–29 March', 'Nick Percat', 'Nick Percat', 'Nick Percat', 'no third race']
SQL:

assistant: SELECT "Race 1 Winner" FROM "Table" WHERE "Circuit" = 'Hidden Valley Raceway';