Re: Calculated view fields (8.1 != 8.2)

Gaetano Mendola <mendola(at)bigfoot(dot)com> writes:
> [ 8.2 evaluates volatile functions in the targetlist of a view ]
> If I mark the function as STABLE or IMMUTABLE then even with version
> 8.2 the function is not evaluated. Is this the intended behavior?

Yes; people complained that we needed to be more careful about the
number of times volatile functions get evaluated.

> I didn't see something about it in the release note.

<listitem>
<para>
Do not flatten subqueries that contain <literal>volatile</>
functions in their target lists (Jaime Casanova)
</para>

<para>
This prevents surprising behavior due to multiple evaluation
of a <literal>volatile</> function (such as <function>random()</>
or <function>nextval()</>). It might cause performance
degradation in the presence of functions that are unnecessarily
marked as <literal>volatile</>.
</para>
</listitem>

regards, tom lane