"Craig A. James" <cjames@modgraph-usa.com> writes:
> Steve Atkins wrote:
>> As long as you're ordering by some row in the table then you can do that in
>> straight SQL.
>>
>> select a, b, ts from foo where (stuff) and foo > X order by foo limit 10
>>
>> Then, record the last value of foo you read, and plug it in as X the next
>> time around.
> We've been over this before in this forum: It doesn't work as advertised. Look for postings by me regarding the fact
thatthere is no way to tell the optimizer the cost of executing a function. There's one, for example, on Oct 18, 2006.
You mean
http://archives.postgresql.org/pgsql-performance/2006-10/msg00283.php
? I don't see anything there that bears on Steve's suggestion.
(The complaint is obsolete as of CVS HEAD anyway.)
regards, tom lane