| From: | Hannu Krosing <hannu(at)tm(dot)ee> |
|---|---|
| To: | Rod Taylor <rbt(at)zort(dot)ca> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>, Gavin Sherry <swm(at)linuxworld(dot)com(dot)au>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Temporary Views |
| Date: | 2002-08-13 17:31:27 |
| Message-ID: | 1029259887.4742.51.camel@rh72.home.ee |
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| Lists: | pgsql-hackers |
On Wed, 2002-08-14 at 00:10, Rod Taylor wrote:
> > > that TODO item was written before we had dependencies, and I think
> > > it's obsolete. Basically the point of the TODO was to avoid
> > > having broken views --- and we have solved that problem.
> >
> > We may have broken views again when "alter table drop column" gets done
>
> Any view depending on a column which is dropped should also be removed
> via the dependency code. Views won't break but you can't drop a column
> that is used in a view without specifying cascade.
>
> This is a case where create or replace view is useful. Change the view
> definition to no longer be dependent on the object you wish to drop.
in case of a 'SELECT *' view it could just be an (automatic) recompile.
the same in case column type gets changed.
---------------
Hannu
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