Re: [HACKERS] Big IN() clauses etc : feature proposal

[Markus Schaber <schabi(at)logix-tt(dot)com>]

Hi, Nils,

Nis Jorgensen wrote:

> It will probably be quite common for the number to depend on the number
> of rows in other tables. Even if this is fairly constant within one db
> (some assumption), it is likely to be different in others using the same
> function definition. Perhaps a better solution would be to cache the
> result of the estimator function.

Sophisticated estimator functions are free to use the pg_statistics
views for their row count estimation.


HTH,
Markus
-- 
Markus Schaber | Logical Tracking&Tracing International AG
Dipl. Inf.     | Software Development GIS

Fight against software patents in EU! www.ffii.org www.nosoftwarepatents.org