Andreas Karlsson <andreas@proxel.se> writes:
> Honestly none of the alternatives is very appealing and v6 is probably
> the least bad.
Yeah, that's about where I'm at with this.
> When I ran into this issue I thought about adding and EMPTY keyword (we
> do not want more keywords) or adding support for specifying array
> literals like this [] or [a, b], but that would be confusing since
> postgresql.conf does not allow any such syntax.
I would have preferred a different keyword. But AFAICS it'd have to
be a fully-reserved word, and creating a new one of those has to
clear a pretty high bar. NULL is not so far off...
regards, tom lane