Re: making EXPLAIN extensible

On Wed, Mar 26, 2025 at 10:40 PM Tom Lane <tgl@sss.pgh.pa.us> wrote:
> Robert Haas <robertmhaas@gmail.com> writes:
> > -         ->  Index Scan using daucus_id_idx on daucus v2_2 (actual
> > rows=0.12 loops=8)
> > +         ->  Index Scan using daucus_id_idx on daucus v2_2 (actual
> > rows=0.13 loops=8)
>
> Even if this had not failed in the buildfarm, it would certainly
> have caused problems for somebody. We have a very strong rule
> that you *do not* make regression test results dependent on exact
> computed cost or rowcount values, because those are inherently
> platform-dependent.  I do not understand how you thought that
> pg_overexplain might be exempt from that problem.

Is this rule written down someplace?

--
Robert Haas
EDB: http://www.enterprisedb.com