"Roberts, Jon" <[EMAIL PROTECTED]> writes:
> What if the new query has a significantly lower cost compared to the older
> one?
Much as I'd like the planner to be infallible, it ain't; estimated costs
are no proof of any real-world performance difference. Better show
EXPLAIN ANALYZE numbers if you want to be taken seriously --- and *not*
ones from a Greenplum-modified PG.
In any case "I can make this particular query faster" seems a rather
different argument from "you guys should eliminate all use of correlated
subqueries".
regards, tom lane
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TIP 6: explain analyze is your friend
