| From: | Richard Guo <guofenglinux(at)gmail(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | pgsql-bugs(at)lists(dot)postgresql(dot)org, francois(dot)jehl(at)pigment(dot)com, Robert Haas <robertmhaas(at)gmail(dot)com> |
| Subject: | Re: BUG #19460: FULL JOIN rewriting issue on empty queries |
| Date: | 2026-04-20 23:04:29 |
| Message-ID: | CAMbWs4-GCupgqfKFX83UvPCBcV_kmZ8TzYrsi_qJUFovjEn1-A@mail.gmail.com |
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| Lists: | pgsql-bugs |
On Tue, Apr 21, 2026 at 7:40 AM Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> Ah: equivclass.c doesn't mind letting em->em_relids be an alias
> for the left_relids or right_relids of some source RestrictInfo.
> That's not problematic as long as those are all constants after
> construction of the EquivalenceClass, but when remove_rel_from_eclass
> is trying to change things, it's a big problem.
ha, I just came to the same conclusion.
> This seems to do the trick to fix it, although I'm going to wait
> for a valgrind regression run to finish before deciding this
> is enough:
This seems safe enough to me. LGTM.
- Richard
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