The writer of "DBD::Teradata" is Dean Arnold of "Prescient". - I've been using his commercial driver for many years - it is WELL worth the cost if you go that route. It has a ton of features that you didn't get with the open version. That said, its been a while since I've checked but I vaguely recall that he re-released his commercial version to fully open (ie free). In any case, its a great driver!
--Dan