Re: [GENERAL] Why extract( ... from timestamp ) is not immutable?

On 1/30/12 5:41 PM, Tom Lane wrote:
> hubert depesz lubaczewski <depesz@depesz.com> writes:
>> On Mon, Jan 30, 2012 at 10:35:21AM -0800, Josh Berkus wrote:
>>> We can't have functions which are immutable or not depending on their
>>> inputs.  That way lies madness.
> 
>> but this is exactly what's happening now.
> 
> Well, the current marking is clearly incorrect.  What to do about that
> is a bit less clear --- should we downgrade the marking, or change the
> function's behavior so that it really is immutable?

AFAIK, the only case which is NOT immutable is extract(epoch FROM
timestamp without time zone), no?

-- 
Josh Berkus
PostgreSQL Experts Inc.
http://pgexperts.com