> > Something I'm curious about: does MySQL support user-defined datatypes?
>
> No, it does not.
>
> > If so, how hard is it to make a new datatype? I think datatype
> > extensibility is one of the cooler features of Postgres ...
Making new datatypes sounds good, but in practice how easy is it to do? I
don't see old SQL92 types like BLOB being supported by the database, and
large objects appears quite broken in its implementation, so adding new
types can't be all that easy to do.
David
