Re: [SQL] Unpredictable text -> date implicit casting behaviour/to_date

Thomas added datetime stuff over the weekend, so I assume this patch
should be applied in the next 24 hours, unless someone objects.

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Karel Zak wrote:
> On Mon, Dec 31, 2001 at 11:02:47AM -0500, Tom Lane wrote:
> > "Aasmund Midttun Godal" <postgresql(at)envisity(dot)com> writes:
> > > The implicit casting of text to date is normally quite good, however i
> > > think it should only use one method during a given query (or maybe
> > > transaction?)
> >
> > Try setting DateStyle to match the date style you are using. Postgres
> > is doing the best it can with ambiguous input.
> >
> > > Added to the fact that to_date has a bug:
> >
> > > SELECT ordredato, ordredato::date, to_date(ordredato, 'DD.MM.YY') from old_faktura where status = 'ANN';
> > > ordredato | ?column? | to_date
> > > -----------+------------+---------------
> > > 18.04.00 | 2000-04-18 | 0001-04-18 BC
> > > 30.08.01 | 2001-08-30 | 2001-08-30
> > > 18.04.00 | 2000-04-18 | 0001-04-18 BC
> >
> > I agree, this is not desired behavior. The problem seems to be that the
> > logic in to_timestamp() tries to use "field is not zero" as a substitute
> > test for "field was provided". At least in the case of the year fields,
> > this is *not* workable. There must be a separate flag bit.
> >
> > regards, tom lane
>
> Nice bug :-(
>
> It's fixed and the patch is attached, please apply it to 7.2.
>
> Thanks for report.
>
> Karel
>
> --
> Karel Zak <zakkr(at)zf(dot)jcu(dot)cz>
> http://home.zf.jcu.cz/~zakkr/
>
> C, PostgreSQL, PHP, WWW, http://docs.linux.cz, http://mape.jcu.cz

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