| From: | Brar Piening <brar(at)gmx(dot)de> |
|---|---|
| To: | Josh Berkus <josh(at)agliodbs(dot)com> |
| Cc: | PostgreSQL-development <pgsql-hackers(at)postgreSQL(dot)org> |
| Subject: | Re: Is there a good reason we don't have INTERVAL 'infinity'? |
| Date: | 2011-11-02 05:35:33 |
| Message-ID: | 4EB0D6A5.8080205@gmx.de |
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| Lists: | pgsql-hackers |
Josh Berkus wrote:
> Hackers,
>
> Is there a reason why INTERVAL 'infinity' is not implemented? That is,
> an interval which is larger than all defined intervals, and which added
> to any timestamp turns it into 'infinity'.
>
> Or is it just Round TUITs?
Probably the latter.
There is even a function |isfinite(interval)| which doesn't seem to do
anything useful.
See complaint in
http://archives.postgresql.org/message-id/200101241913.f0OJDUu45423@hub.org
Although the operation used in this complaint isn't obviously defined
there certainly are operations that are defined like infinity + infinity
= infinity.
See http://de.wikipedia.org/wiki/Unendlichkeit#Analysis
(Sorry for linking the german wikipedia - the english text is ways less
verbose on this.)
Regards,
Brar
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