* @param array $aliasMap  Array that maps DQL aliases to their components
     *                         (DQL alias => array(
     *                              'metadata' => Table object,
     *                              'parent' => Parent DQL alias (if any),
     *                              'relation' => Relation object (if any),
     *                              'map' => Custom index to use as the key in the result (if any),
     *                              'agg' => List of aggregate value names (sql alias => dql alias)
     *                              )
     *                         )