Preheat oven to 350 degrees F and grease a 9-by-13-inch baking dish with butter spray.
In a large bowl, combine the cherry pie filling and pineapple. Pour the mixture into the baking dish. Sprinkle the dry cake mix evenly over the filling. Drizzle the melted butter over the top of the cake mix. Sprinkle the pecans over the cobbler. Bake until the top of the cobbler is golden brown, 45 to 55 minutes. Serve warm, with ice cream if desired.
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