Melt the butter in a large skillet over medium-high heat. Add the onion, apple, celery, garlic, thyme, mace, remaining 1 teaspoon salt and pepper, to taste. Cook until the vegetables soften, about 5 minutes. Stir in sausage, breaking it up with a wooden spoon and cook until it loses most of its rosy color, but not so much that it's dry, about 5 minutes more. Stir in the cooked wild rice, pecans, and parsley into the vegetable mixture.