Description:
------------
When using the mssql_* functions it is possible to read column meta data using mssql_fetch_field in conjunction with the freetds library. However it is not possible to use PDOStatement::getColumnMeta using the same library.

The library must support this functionality in some way even if limited, the additional attributes may be set to false or NULL.

Reproduce code:
---------------
$conn = new PDO("dblib:host=myhost","user","pass");

$rs = $conn->query("SELECT * FROM SOMETABLE");

print_r($rs->getColumnMeta(0));

Expected result:
----------------
Array(
"key" => "value",
"key" => "value",
"key" => "value",
"key" => "value"
);

Actual result:
--------------
Warning: PDOStatement::getColumnMeta() [pdostatement.getcolumnmeta]: SQLSTATE[IM001]: Driver does not support this function: driver doesn't support meta data