user: Question: What is the attendance of the game on 2007-04-07 with the Warriors as the visitor team?
Columns: ['Date', 'Visitor', 'Score', 'Home', 'Leading scorer', 'Attendance', 'Record']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['2007-04-01', 'Grizzlies', '117–122', 'Warriors', 'Jason Richardson (26)', 17198.0, '35–39']
SQL:

assistant: SELECT "Attendance" FROM "Table" WHERE "Visitor" = 'Warriors' AND "Date" = '2007-04-07';