From: | Stephan Szabo <sszabo(at)megazone(dot)bigpanda(dot)com> |
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To: | Dmitry Tkach <dmitry(at)openratings(dot)com> |
Cc: | <mel(at)gmanmi(dot)tv>, <pgsql-novice(at)postgresql(dot)org> |
Subject: | Re: help: now() + N is now failing! |
Date: | 2003-07-29 15:08:51 |
Message-ID: | 20030729080443.C87665-100000@megazone.bigpanda.com |
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Thread: | |
Lists: | pgsql-novice |
On Tue, 29 Jul 2003, Dmitry Tkach wrote:
> Yeah... Looks weird.
> For some reason, even date_pli(now(), 2) doesn't work any more - you
> have to do date_pli(now()::date,2)
> I guess, the now()+2 has the same problem - for some reason, it fails to
> coerce timestamptz into date automatically :-(
> Why is that? There is only one function called date_pli(), and there is
> an unambigous conversion date(timestamptz)... Why does it now force the
> user to cast explicitly???
It's not an implicit cast any longer (see pg_cast). Implicit casts often
result in unexpected behavior.
For example, what should now()+2 mean? Converting to date and adding two
days is fairly wierd behavior, I'd much more expect it to say add 2
seconds or error. now() + interval '2 days' or cast(now() as date)+2 both
express the intent of adding 2 days much better.
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