user: Question: Who were the Visitor of the Toronto Maple Leafs Home game on December 22?
Columns: ['Date', 'Visitor', 'Score', 'Home', 'Record']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['November 12', 'Chicago Black Hawks', '2–1', 'Toronto Maple Leafs', '0–1–0']
SQL:

assistant: SELECT "Visitor" FROM "Table" WHERE "Home" = 'Toronto Maple Leafs' AND "Date" = 'December 22';