Re: More outdated examples

The following applied patch removes the section Tom thought wasn't
needed anymore.

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Tom Lane wrote:
> Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> writes:
> > I can find no suitable replacement for this example. Can anyone else?
>
> > Peter Eisentraut wrote:
> >> This example in User's Guide section 7.2 doesn't work anymore at all:
> >>
> >> tgl=> select @ text '-4.5' as "abs";
>
> Both of the examples in this section have been obsoleted by our recent
> elimination of a lot of implicit casts. This one would still work if
> text-to-float8 were an implicit cast, but it's not anymore. Also,
> though the second one still acts as described, the reason given for it
> in the text is wrong: the system is not unable to choose among multiple
> alternatives. Rather, it finds *no* alternatives, again because the
> text-to-various-int-types casts are no longer implicit.
>
> The closest similar cases that I can find for the first example are not
> good replacements because they are also slated for destruction :-(.
> Basically, I see us moving away from the preferred-type mechanism, and
> perhaps eliminating it entirely soon.
>
> I'd just remove the whole of Example 7.3, I think. The mechanisms are
> still there, for now, but they are not invoked in any standard cases.
>
> regards, tom lane
>

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