Re: More outdated examples
От | Peter Eisentraut |
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Тема | Re: More outdated examples |
Дата | |
Msg-id | Pine.LNX.4.44.0303201201080.2112-100000@peter.localdomain обсуждение исходный текст |
Ответ на | Re: More outdated examples (Bruce Momjian <pgman@candle.pha.pa.us>) |
Ответы |
Re: More outdated examples
|
Список | pgsql-hackers |
The specific case that Tom complained about wasn't even in the latest documentation sources anymore. I think the patch should be reverted. Bruce Momjian writes: > > The following applied patch removes the section Tom thought wasn't > needed anymore. > > --------------------------------------------------------------------------- > > Tom Lane wrote: > > Bruce Momjian <pgman@candle.pha.pa.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 > > > > -- Peter Eisentraut peter_e@gmx.net
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