N1qlQuery::fromString - no support for compound statements?

Is the PHP driver not capable of executing simple compound statements (separated by semicolon)? I can do this in the console:

"SELECT x FROM b; SELECT y FROM b"

When executed in the console, the results are grouped using some special keys:

"_sequence_num": 1,
    "_sequence_query": "SELECT x FROM b",
    "_sequence_query_status": "success",
    "_sequence_result": [
   etc...

But if I put the same SQL into the PHP driver and try to execute via N1QlQuery::fromString(), the driver throws an exception with syntax error - despite the syntax being valid.

How can I execute a simple compound query in PHP?