Re: Commits 8de72b and 5457a1 (COPY FREEZE)

On 2012-12-06 14:07:32 +0000, Simon Riggs wrote:
> On 6 December 2012 13:12, Andres Freund <andres@2ndquadrant.com> wrote:
> > Hi,
> >
> > On 2012-12-03 17:34:01 -0800, Jeff Davis wrote:
> >> http://git.postgresql.org/gitweb/?p=postgresql.git;a=commitdiff;h=8de72b66a2edcf12c812de0a73bd50b6b7d81d62
> >
> > On the subject of that patch. I am not a big fan of only emitting a NOTICE if
> > FREEZE wasn't properly used:
> >
> > +       if (cstate->freeze && (hi_options & HEAP_INSERT_FROZEN) == 0)
> > +               ereport(NOTICE,
> > +                               (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
> > +                                errmsg("FREEZE option specified but pre-conditions not met")));
> > +
> >
> > Imo it should fail. Imagine adding FREEZE to the loading part of your
> > application and not noticing the optimization broke because somebody
> > else changed something in another part of the loading procedure.
> >
> > Not sure whether that discussed previously.
>
> It was. Only Robert and I spoke about that.
>
> Also imagine having to analyze your code in detail to reevaluate the
> exact optimisation required each time. This way you get to add FREEZE
> and have it work always, with feedback if its not optimized.

I remain unconvinced by that argument, but if I am alone with this
ok. Could we at least make it a WARNING? Nobody ever reads NOTICEs
because it contains so much noise. And this is isn't noise. Its a bug
on the client side.

Greetings,

Andres Freund

--Andres Freund                       http://www.2ndQuadrant.com/PostgreSQL Development, 24x7 Support, Training &
Services