"David G. Johnston" <david.g.johnston@gmail.com> writes: > On Fri, Apr 17, 2020 at 4:04 PM Tom Lane <tgl@sss.pgh.pa.us> wrote: >> Especially not for unary operators, where >> ALTER OPERATOR would have us write "- (NONE, integer)".
> I'd drop the parens for unary and just write "- integer"
We do have some postfix operators still ... although it looks like there's only one in core. In any case, the signature line is *the* thing that is supposed to specify what the syntax is, so I'm not too pleased with using an ambiguous notation for it.
Neither:
- (NONE, integer)
nor
! (integer, NONE)
seem bad, and do make very obvious how they are different.
The left margin scanning ability for the symbol (hey, I have an expression here that uses @>, what does that do?) seems worth the bit of novelty required.
