On Mon, Aug 24, 2009 at 02:31:35PM -0400, Tom Lane wrote: > David Fetter <da...@fetter.org> writes: > > He expected '-' to subtract seconds, just as '+' added them. > > Ah. Well, what it boils down to is that in a scenario like > > known_type_expr operator unknown_literal > > we preferentially consider unknown_literal to be of the same type as > the other operand. But there's no timestamp plus timestamp operator > (doesn't seem like a sensible operation to me, does it to you?),
Doesn't seem sensible to me, either. > so there's only one possible typing of the unknown literal, and it's > not that. Plus and minus just aren't all that symmetrical in this > situation. I'm thinking that the unknown literal here should just cause an error in the case of '+'. Same with '-', for what it's worth. Cheers, David (There's something happening here. What is ain't exactly clear.) -- David Fetter <da...@fetter.org> http://fetter.org/ Phone: +1 415 235 3778 AIM: dfetter666 Yahoo!: dfetter Skype: davidfetter XMPP: david.fet...@gmail.com Remember to vote! Consider donating to Postgres: http://www.postgresql.org/about/donate -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
