Description:
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Using SET ROWCOUNT does not return a result set (which could be expected), but it also affects the rowcounts of other queries.  The same with SET NOCOUNT ON.  I would expect one of the following behaviors:

1. Return empty resultset with columnCount() = 0 and rowCount() = -1; call to nextRowset() returns true
2. Does not return any resultset BUT ALSO doesn't affect other queries.

See example below.

Test script:
---------------
<?php                                                                                    
$db = new \PDO("dblib:host=server;dbname=database", "username", "password");
$stmt = $db->query("SET ROWCOUNT 10; INSERT INTO tbl VALUES (1, 'a'), (2, 'b');");
var_dump($stmt->rowCount());
var_dump($stmt->nextRowset());
var_dump($stmt->rowCount());
?>

Expected result:
----------------
int(-1)
bool(true)
int(2)

Actual result:
--------------
int(-1)
bool(false)
int(-1)