user: Question: What is the lowest grid number when Colin Edwards is the rider?
Columns: ['Rider', 'Manufacturer', 'Laps', 'Time/Retired', 'Grid']
Types: ['text', 'text', 'real', 'text', 'real']
Sample row: ['Casey Stoner', 'Ducati', 22.0, '42:36.587', 4.0]
SQL:

assistant: SELECT MIN("Grid") FROM "Table" WHERE "Rider" = 'Colin Edwards';