f35bce4505
The main consumer of this feature is shortcuts. The LOOKUP KEY column will contain an encoded concatenation of the contact's row id as well as sync_ids of all constituent raw contacts. It goes with the "contacts/lookup/*/#" URI. When we get such a URI, we will first try to load the contact with the specified _id and lookup_key. If we cannot find the contact that way, we will go scout for the contact that contains most of the sync_ids we found in the lookup key. We will need to make sure that the contact picker returns the lookup-style URIs.