'Gets if users share a room.
Args:
user_id (str): Must be a local user_id
other_user_id (str)
Returns:
bool|None: None if they don\'t share a room, otherwise whether they
share a private room or not.'

@cached(max_entries=500000)
def get_if_users_share_a_room(self, user_id, other_user_id):

    return self._simple_select_one_onecol(table='users_who_share_rooms', keyvalues={'user_id': user_id, 'other_user_id': other_user_id}, retcol='share_private', allow_none=True, desc='get_if_users_share_a_room')
