Re: jsonb format is pessimal for toast compression

On Fri, Sep 19, 2014 at 5:40 AM, Heikki Linnakangas
<hlinnakangas@vmware.com> wrote:
> I think we should bite the bullet and break compatibility with 9.4beta2
> format, even if we go with "my patch". In a jsonb object, it makes sense to
> store all the keys first, like Tom did, because of cache benefits, and the
> future possibility to do smart EXTERNAL access. Also, even if we can make
> the on-disk format compatible, it's weird that you can get different runtime
> behavior with datums created with a beta version. Seems more clear to just
> require a pg_dump + restore.

I vote for going with your patch, and breaking compatibility for the
reasons stated here (though I'm skeptical of the claims about cache
benefits, FWIW).

-- 
Peter Geoghegan