First of all, thank you for your suggestion. I registered new issues
on gheimdall's issue tracker.
http://code.google.com/p/gheimdall/issues/detail?id=10
Ideally, the new module should be usable with many RDBMS systems. So,
I'm going to implement it in that way, and as the result, the
implementation may take long time.
Regards,
-- Takashi