Combine apples, celery, and pecans in a bowl.
Whisk mayonnaise, sugar, lemon juice, and cinnamon together in a separate bowl until well combined.
Whip heavy cream with an electric mixer until soft peaks form; fold into mayonnaise mixture to form a creamy dressing.
Fold apple mixture into the dressing until coated; chill in refrigerator for about 1 hour.
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