VOMS MySQL plugin uses a signed long int for querying the user id, and return it to VOMS server, but an int should be used instead, as the MYSQL_LONG_TYPE is 4 bytes long.

The main consequence of this is that in the VOMS server log UID is logged using the wrong format:

LOG_INFO:REQUEST:makeAC (vomsd.cc:935):Userid = "-4294967169""

Probably the mistake in the type selection was caused by the misleading type name, see:

https://bugs.mysql.com/bug.php?id=4653