On Sat, Dec 6, 2014 at 10:08 PM, Tomas Vondra <tv@fuzzy.cz> wrote:
> select a.i, b.i from a join b on (a.i = b.i);
I think the concern is that the inner side might be something more
elaborate than a plain table scan, like an aggregate or join. I might
be all wet, but my impression is that you can make rescanning
arbitrarily expensive if you work at it.
--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
