Grease 13x9x2" glass dish. Spread undrained pineapple on bottom. Spoon pie filling over pineapple. Sprinkle dry cake mix over pineapple-cherry mixture. Top with chopped pecans. Slice butter into small pats and place evenly on top of pecans. Bake at 350 deg. Approximately 50 minutes. No mixing bowls to clean up!