Preheat oven to 350 degrees.
Mix together cake mix and crushed pineapple and pour into a greased 9x13.
Bake for 25-30 minutes or until a toothpick comes out clean.
Allow the cake to fully cool, then crumble.
Mix together yogurt and pudding mix.
In a trifle bowl, layer crumbled cake, yogurt mixture, and whipped topping. Repeat, ending with the whipped topping. Top with chopped pecans.