Subject: Re: gen_random_uuid() is immutable in Pg 13devel
To: depesz@depesz.com, pgsql-bugs mailing list <pgsql-bugs@postgresql.org>
References: <20200218185452.GA8710@depesz.com>
From: Peter Eisentraut <peter.eisentraut@2ndquadrant.com>
Organization: 2ndQuadrant
Message-ID: <c8c67581-bf88-5b26-c1ec-bd9ada9bb650@2ndquadrant.com>
Date: Wed, 19 Feb 2020 20:19:00 +0100
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On 2020-02-18 19:54, hubert depesz lubaczewski wrote:
> Hi,
> I noticed that get_random_uuid() from pgcrypt is marked as immutable.
> 
> Up to 12.2 it was volatile, and in 13 it became immutable.
> 
> This leads to "interesting" change, that:
> 
> select gen_random_uuid() from generate_series(1,10);
> 
> returns 10 different uuids before 13, and 10 identical ones on 13devel.
> 
> It looks that commit 5925e5549890416bcf588334d9d0bc99f8ad6c7f forgot to
> mark the function as volatile. Not sure if it was intentional.

Fixed, thanks.

It was indeed the result of confusion about the default value.

-- 
Peter Eisentraut              http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services