Andriy Tkachuk wrote:
> On Wed, 8 Oct 2003, Tom Lane wrote:
>
>
>>Andriy Tkachuk <ant@imt.com.ua> writes:
>>
>>>At second. calc_total() is immutable function:
>>>but it seems that it's not cached in one session:
>>
>>It's not supposed to be.
>
>
> but it's written id doc:
>
> IMMUTABLE indicates that the function always returns the same
> result when given the same argument values; that is, it does not
> do database lookups or otherwise use information not directly
> present in its parameter list. If this option is given, any call
> of the function with all-constant arguments can be immediately
> replaced with the function value.
The doc say "can be" not must and will be.
Regards
Gaetano Mendola