| From: | Josh Berkus <josh(at)agliodbs(dot)com> |
|---|---|
| To: | pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: [GENERAL] Why extract( ... from timestamp ) is not immutable? |
| Date: | 2012-01-30 18:35:21 |
| Message-ID: | 4F26E2E9.50802@agliodbs.com |
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| Lists: | pgsql-general pgsql-hackers |
> preferably I would see extract( epoch from timestamp ) to be really
> immutable, i.e. (in my opinion) it should treat incoming data as UTC
> - for epoch calculation.
> Alternatively - perhaps epoch extraction should be moved to specialized
> function, which would have swapped mutability:
We can't have functions which are immutable or not depending on their
inputs. That way lies madness.
> get_epoch(timestamptz) would be immutable
> while
> get_epoch(timestamp) would be stable
Well, to_epoch, in order to be consistent with other conversion functions.
--
Josh Berkus
PostgreSQL Experts Inc.
http://pgexperts.com
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