Re: effective SELECT from child tables

On Sat, Oct 01, 2005 at 10:05:22AM -0400, mark@mark.mielke.cc wrote:
> It has the 'side or additional benefit' being requested here. The ability
> to filter the child table by some attribute. For example, if the child
> tables are used for partitioning, and the attribute were to keep a date
> range, the field restriction optimization could be used to automatically
> determine the set of tables to use for the date range specified. With
> such a change, it would even work automatically if the date ranges
> overlapped for some reason. Selecting a table name by date is hacky. This
> sort of solution would be a general solution to the problem.

This is what "Constraint Exclusion" does. It uses CHECK constraints on
a table to filter out tables that obviously don't apply to a query.
It's just the the specific case of "tableoid = XXX" is not supported
right now.

Have a nice day,
-- 
Martijn van Oosterhout      http://svana.org/kleptog/
> Patent. n. Genius is 5% inspiration and 95% perspiration. A patent is a
> tool for doing 5% of the work and then sitting around waiting for someone
> else to do the other 95% so you can sue them.