Seems this is already a TODO:
* Have sequence dependency track use of DEFAULT sequences, seqname.nextval
---------------------------------------------------------------------------
Tom Lane wrote:
> Tara Piorkowski <tara@vilaj.com> writes:
> > Regardless, my thinking had been that I was looking at an INT with a
> > DEFAULT set, in which case I think this would be a bonified bug, thus my
> > report.
>
> Right --- but *if you'd declared it that way*, the system would have
> reacted in the way you were expecting. SERIAL sets up dependencies that
> prevent you from dropping the sequence as a separate entity, while an
> INT column with a handmade DEFAULT expression doesn't.
>
> Ideally, a SERIAL column would completely hide the fact that it's made
> from a sequence and a default expression. We're not there yet ... but
> 7.3 is closer than ever before. (It'd be interesting to look at whether
> Rod Taylor's DOMAIN work could help button things up.)
>
> regards, tom lane
>
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