user: Question: What is the average Points when the engine was a Climax Straight-4 earlier than 1958?
Columns: ['Year', 'Entrant', 'Chassis', 'Engine', 'Points']
Types: ['real', 'text', 'text', 'text', 'real']
Sample row: [1957.0, 'J B Naylor', 'Cooper T43 F2', 'Climax Straight-4', 0.0]
SQL:

assistant: SELECT AVG("Points") FROM "Table" WHERE "Engine" = 'Climax Straight-4' AND "Year" < 1958.0;