Re: query plan ignoring check constraints

On Mon, Jun 20, 2005 at 10:35:24AM -0700, Josh Berkus wrote:
> Rohit,
> 
> > Now, when I do a select on the basetable with a range of ids, it looks up
> > each subtable that inherits from the base table and using an indexed scan
> > searches for values in the range. It does it even for subtables whose check
> > constraint completely rules out the possibility of it containing any such
> > row . Should not check constraint act as the first filter? The index should
> > ideally be scanned only when the check constraint is passed by the search
> > criteria but surprisingly it did not happen. The explain analyze showed
> > cost for index scans of subtables that cannot contain rows matching the
> > search criteria.
> 
> This is called "range partitioning".   We're working on it.  You're welcome to 
> join the Bizgres project where most of the discussion on this feature takes 
> place:

Why are you discussing development there?  I can see in the archives
that people are talking about changing page format, semantics of tuple
info bits, and it's not getting to some "people that matters."

-- 
Alvaro Herrera (<alvherre[a]surnet.cl>)
La web junta la gente porque no importa que clase de mutante sexual seas,
tienes millones de posibles parejas. Pon "buscar gente que tengan sexo con
ciervos incendiándose", y el computador dirá "especifique el tipo de ciervo"
(Jason Alexander)