title: is it possible to get distinct results when using an NSFetchedResultsController?
body: <p>I have a product search that searches the ProductCategories my products are in, sometimes my products are in multiple categories which gives me duplicate results.  I don't want to search the product table directly because there are several products that have multiple sizes but are basically the same product. </p>
  
  <p>Is there a way to get distinct search results with an NSFetchedResultsController?</p>