user: Question: If Collingwood is playing away, who played as the home team?
Columns: ['Home team', 'Home team score', 'Away team', 'Away team score', 'Venue', 'Crowd', 'Date']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['Hawthorn', '22.15 (147)', 'Melbourne', '9.14 (68)', 'Princes Park', 10632.0, '1 April 1978']
SQL:

assistant: SELECT "Home team" FROM "Table" WHERE "Away team" = 'Collingwood';