On Fri, Apr 17, 2020 at 4:17 PM Tom Lane <t...@sss.pgh.pa.us> wrote: > "David G. Johnston" <david.g.johns...@gmail.com> writes: > > On Fri, Apr 17, 2020 at 4:04 PM Tom Lane <t...@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. David J.
