Re: What is the name pseudo column

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От David Fetter
Тема Re: What is the name pseudo column
Дата
Msg-id 20101215235203.GB29481@fetter.org
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Ответ на Re: What is the name pseudo column  (Adrian Klaver <adrian.klaver@gmail.com>)
Список pgsql-general
On Wed, Dec 15, 2010 at 03:43:45PM -0800, Adrian Klaver wrote:
> On Wednesday 15 December 2010 1:27:19 pm David Fetter wrote:
> > On Wed, Dec 15, 2010 at 01:50:54PM -0600, Jack Christensen wrote:
> > > I was just surprised when accidentally selecting a non-existent name
> > > column there was no error -- instead something came back.
> > >
> > > select accounts.name from accounts limit 1 ->
> > > (1,65522,1,0.00,,"2010-07-22 09:57:26.281172-05",2)
> > >
> > > It appears it tries to return the entire row in an array (but longer
> > > rows get truncated).
> > >
> > > I've searched Google and the PG docs but I haven't had any luck.
> >
> > What happened here is that you ran into PostgreSQL's "charming" habit
> > of using the argument.function notation, so you called the "name"
> > function, i.e. the one that casts to name, on the entire row from your
> > accounts table.
> >
> > Cheers,
> > David.
> >
>
> In the for what is worth department that behavior is going away in 9.1. See here
> for a detailed explanation:
> http://www.depesz.com/index.php/2010/11/08/waiting-for-9-1-removed-autocast-footgun/#more-1908

I'd missed this bit of good news :)

Cheers,
David.
--
David Fetter <david@fetter.org> http://fetter.org/
Phone: +1 415 235 3778  AIM: dfetter666  Yahoo!: dfetter
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