Re: pg15b1: FailedAssertion("val > base", File: "...src/include/utils/relptr.h", Line: 67, PID: 30485)

On Wed, Jun 1, 2022 at 9:09 AM Tom Lane <tgl@sss.pgh.pa.us> wrote:
> Robert Haas <robertmhaas@gmail.com> writes:
> > Could it use something other than its own address as the base address?
>
> Hmm, maybe we could make something of that idea ...
>
> > One way to do this would be to put it at the *end* of the
> > "Preallocated DSM" space, rather than the beginning.
>
> ... but that way doesn't sound good.  Doesn't it just move the
> problem to the first object allocated inside the FPM?

Count we make the relptrs 1-based, so that 0 is reserved as a sentinel
that has the nice memset(0) property?