Tom Lane wrote:
> Alvaro Herrera <alvherre@commandprompt.com> writes:
> > Tom Lane wrote:
> >> I'm fairly sure this query is illegal per spec. There are ancient
> >> discussions in the archives about whether aggregates in an UPDATE target
> >> list can have a consistent interpretation or not. We never found one,
> >> but never got around to disallowing it either. Maybe it's time. If you
> >> try it with something like sum() you don't get a crash, but you do get
> >> rather bizarre behavior.
>
> > Yeah, I agree we should disallow it. For the curious, the bizarre behavior
> > is
>
> > alvherre=# update pk set id = count(id) ;
> > ERROR: ctid is NULL
>
> Hmm, what version are you testing? What I see is that it updates a
> single one of the table rows :-(
The trick seems to be that the table must be empty. I'm doing this in
8.1.3.
--
Alvaro Herrera http://www.CommandPrompt.com/
The PostgreSQL Company - Command Prompt, Inc.
