On Thu, Jun 27, 2024 at 1:11 AM Tom Lane <t...@sss.pgh.pa.us> wrote: > > David Rowley <dgrowle...@gmail.com> writes: > > Maybe I'm slow on the uptake, but I've yet to see anything here where > > time literals act in a special way DEFAULT constraints. This is why I > > couldn't understand why we should be adding documentation about this > > under CREATE TABLE. > > It's not that the parsing rules are any different: it's that in > ordinary DML queries, it seldom matters very much whether a > subexpression is evaluated at parse time versus run time. > In CREATE TABLE that difference is very in-your-face, so people > who haven't understood the rules clearly can get burnt. > > However, there are certainly other places where it matters, > such as queries in plpgsql functions. So I understand your > reluctance to go on about it in CREATE TABLE. At the same > time, I see where David J. is coming from. > > Maybe we could have a discussion of this in some single spot, > and link to it from CREATE TABLE and other relevant places? > ISTR there is something about it in the plpgsql doco already. >
+1 to this idea.
