Re: MAX/MIN optimization via rewrite (plus query rewrites generally) - Mailing list pgsql-hackers

On Thu, Nov 11, 2004 at 11:48:49AM +1300, Mark Kirkwood wrote:
> I am looking at implementing this TODO item. e.g. (max case):
> 
> rewrite
> SELECT max(foo) FROM bar
> as
> SELECT foo FROM bar ORDER BY foo DESC LIMIT 1
> if there is an index on bar(foo)
Out of curiosity, will you be doing this in such a way that 

SELECT min(foo), max(foo) FROM bar

will end up as

SELECT (SELECT foo FROM bar ORDER BY foo ASC LIMIT 1), (SELECT ... DESC
LIMIT 1)

?
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Jim C. Nasby, Database Consultant               decibel@decibel.org 
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