Thomas Hamilton wrote: > When run against a large dataset with a small number of distinct results > HashAggregate is an order of magnitude more efficient! > > Since the spec does not require DISTINCT to return sorted results, I don't > believe Sort ... Unique will ever be more efficient than HashAggregate.
This is not a bug -- merely a missing optimizer feature, which as it turns out was implemented in 8.4. -- Alvaro Herrera http://www.CommandPrompt.com/ The PostgreSQL Company - Command Prompt, Inc. -- Sent via pgsql-bugs mailing list (pgsql-bugs@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-bugs
