Re: pg_upgrade: How to deal with toast

Zdenek Kotala wrote:
> Tom Lane napsal(a):
> > Zdenek Kotala <Zdenek.Kotala@Sun.COM> writes:
> >> Heikki Linnakangas napsal(a):
> >>> Perhaps we should just add the new attid attribute to the toast table, 
> >>> but mark it as nullable?
> > 
> >> Hmm, It seems to me as a good idea.
> > 
> > No, it's a really horrid idea.  Nullable attributes complicate the C
> > code, and what in the world are we buying with it anyway?  Just decide
> > what the field should contain and put it in there.
> 
> The problem what we try to solve is to perform this change during upgrade from 
> 8.3->8.4. Extra value is a problem because it requires extra space and there is 
> not free space. It is temporal solution(hack) for 8.3->8.4.

Once we have the 'require free space' capability in a major Postgres
release, can't we use that to make space for the new TOAST field we will
need?

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