"David G. Johnston" <david.g.johnston@gmail.com> writes:
> On Thursday, May 12, 2016, Tom Lane <tgl@sss.pgh.pa.us
> <javascript:_e(%7B%7D,'cvml','tgl@sss.pgh.pa.us');>> wrote:
>> (I'm not particularly in love with the node type name
>> ValueFunction; anybody got a better idea?)
> SQL99DateTimeFunction (or roughly whenever they were introduced)?
Some of them aren't datetime-related, though. I thought about
NiladicFunction but it seemed maybe too technical.
> I agree with the premise. I took notice of it recently in explain output
> on these lists using current_date. That example read like
> ('now'::cstring)::date which was really odd since I was at least expecting
> text as the intermediate cast...
Yeah, that's another fun thing: the reverse listing currently differs
depending on whether you're looking at an expression tree that's been
through const-folding. It didn't use to --- looks like the mention
of cstring started in 9.2.
regards, tom lane