Quoting is not supported in pdo_odbc driver

trying to execute this dql:

SELECT p FROM my\namespace\entities\PQR p WHERE p.razon = 'TEL'

it built this native sql (iseries)

SELECT t0_.SGNUMÑ AS SGNUMÑ0, t0_.SGCAUS AS SGCAUS1, t0_.SGREAS AS SGREAS2 FROM SGMASTL7 t0_ WHERE t0_.SGCAUS =

because pdo is created with odbc[1], quote method[2] is not supported, and Doctrine/DBAL/Connection.php#quote()[3] method returns an empty value for <'TEL'> expression, so Database throws a Syntax error. It should be support for drivers which doesn't have implemented quote() method.

[1] with odbc: $pdo = new PDO("odbc:MY_ODBC_NAME", "USER", "PASSWORD");
[2] http://php.net/manual/en/pdo.quote.php
[3] https://github.com/doctrine/dbal/blob/2.0.3/lib/Doctrine/DBAL/Connection.php#L520