Excerpts from David Fetter's message of mié dic 22 12:36:10 -0300 2010: > On Wed, Dec 22, 2010 at 03:00:16PM +0000, Simon Riggs wrote: > > On Wed, 2010-12-22 at 09:03 -0500, Andrew Dunstan wrote:
> > > Quite apart from other reasons, such as possible ephemerality of > > > the data, the difficulty of taking a reasonable random sample from > > > an arbitrary foreign data source seems substantial, and we surely > > > don't want ANALYSE to have to run a full sequential scan of a > > > foreign data source. > > > > I think we need something that estimates the size of a table, at > > least, otherwise queries will be completely un-optimised. > > The estimated size for a lot of things--streams of data, for > example--is infinity. I suppose that's a good default for some cases. Since we don't have streaming queries, this would seem rather pointless ... Surely the FDW must be able to limit the resultset somehow. -- Álvaro Herrera <alvhe...@commandprompt.com> The PostgreSQL Company - Command Prompt, Inc. PostgreSQL Replication, Consulting, Custom Development, 24x7 support -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
