What's the highest scoring team in the round in Ring Knutstorp in which Polestar Racing is the winning team?
create table table_20079931_4 (highest_scoring_team varchar, circuit_location varchar, winning_team varchar, PRIMARY KEY (highest_scoring_team))
select highest_scoring_team from table_20079931_4 where circuit_location = "ring knutstorp" and winning_team = "polestar racing"