Spread pineapple with juice over bottom of 9x13 pan. Spoon on pie filling so it sits in a layer on top(be careful not to mix it). Sprinkle dry cake mix over top. Sprinkle chopped pecans(chopped small). Drizzle melted butter over top. Bake for 45 minutes at 350. Serve hot with whipped cream or cool whip(can also be served cold).