Sebastian,

> I'm having another problem with a query that takes to long, because
> the appropriate index is not used.

PostgreSQL is not currently able to push down join criteria into UNIONed 
subselects.   It's a TODO. 

Also, if you're using inherited tables, it's unnecessary to use UNION; just 
select from the parent.

-- 
Josh Berkus
Aglio Database Solutions
San Francisco

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