On Tue, 18 Jun 2024 23:02:14 -0700 "David G. Johnston" <david.g.johns...@gmail.com> wrote:
> On Tuesday, June 18, 2024, Tom Lane <t...@sss.pgh.pa.us> wrote: > > > Yugo NAGATA <nag...@sraoss.co.jp> writes: > > > On Tue, 18 Jun 2024 20:56:58 -0700 > > > "David G. Johnston" <david.g.johns...@gmail.com> wrote: > > >> But it is neither a keyword nor an identifier. > > > > The lexer would be quite surprised by your claim that NULL isn't > > a keyword. Per src/include/parser/kwlist.h, NULL is a keyword, > > and a fully reserved one at that. > > > > > > > > Can’t it be both a value and a keyword? I figured the not null constraint > and is null predicates are why it’s a keyword but the existence of those > doesn’t cover its usage as a literal value that can be stuck anywhere you > have an expression. I still wonder it whould be unnecessary to mention the case-insensitivity here if we can say NULL is *also* a keyword. Regards, Yugo Nagata > David J. -- Yugo NAGATA <nag...@sraoss.co.jp>
