A boolean parameter for NoType:android/provider/ContactsContract$CommonDataKinds$Phone;Href=../../../reference/android/provider/ContactsContract.CommonDataKinds.Phone.html#CONTENT_URI, NoType:android/provider/ContactsContract$CommonDataKinds$Email;Href=../../../reference/android/provider/ContactsContract.CommonDataKinds.Email.html#CONTENT_URI, and NoType:android/provider/ContactsContract$CommonDataKinds$StructuredPostal;Href=../../../reference/android/provider/ContactsContract.CommonDataKinds.StructuredPostal.html#CONTENT_URI. This enables a content provider to remove duplicate entries in results.

[Android Documentation]