如何通过PHP SDK获取N1QL查询结果中的度量对象

Can I get the metrics object of the following N1QL query within the result

$myBucket = $myCluster->openBucket();
$myBucket->enableN1ql(array('http://1.1.1.1:8093/','http://1.1.1.2:8093/'));
$query = CouchbaseN1qlQuery::fromString('SELECT * FROM default');
$res = $myBucket->query($query);
var_dump($res);

Pls check following post.. it suggests a solution: https://forums.couchbase.com/t/how-to-get-metrics-within-the-result-of-n1ql-query-through-php-sdk/8440