Marcus,

> The problem, as I understand it, is that 7.4 introduced massive
> improvements in handling moderately large in() clauses, as long as they
> can fit in sort_mem, and are provided by a subselect.

Also, this problem may be fixed in 7.5, when it comes out.  It's a known 
issue.

-- 
Josh Berkus
Aglio Database Solutions
San Francisco

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