foo == 'bar'           #=> ["foo = ?", 'bar']
foo =~ '%bar'          #=> ["foo LIKE ?", '%bar']
foo <=> (1..5)         #=> ["foo BETWEEN ? AND ?", 1, 5]
id === [1, 2, 3, 5, 8] #=> ["id IN(?)", [1, 2, 3, 5, 8]]