Horton

Re: BUG #19435: Error: "No relation entry for relid 2" Triggered by Complex Join with Self-Referencing Tables

Tender Wang <tndrwang@gmail.com>

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From: Tender Wang <tndrwang@gmail.com>
To: Alexander Korotkov <aekorotkov@gmail.com>
Cc: Andrei Lepikhov <lepihov@gmail.com>, Kirill Reshke <reshkekirill@gmail.com>, Fujii Masao <masao.fujii@gmail.com>, ammmkilo@163.com, pgsql-bugs@lists.postgresql.org
Date: 2026-03-19T01:11:10Z
Lists: pgsql-bugs 
Alexander Korotkov <aekorotkov@gmail.com> 于2026年3月18日周三 22:38写道：
>
> On Wed, Mar 18, 2026 at 3:31 PM Andrei Lepikhov <lepihov@gmail.com> wrote:
> > On 18/3/26 13:21, Alexander Korotkov wrote:
> > > On Wed, Mar 18, 2026 at 2:18 PM Andrei Lepikhov <lepihov@gmail.com> wrote:
> > >> What is the reason for the second change? Tender, can you show us how to
> > >> reproduce the issue so we can support your update to
> > >> restrict_infos_logically_equal? If we include it, we should add a test.
> > >
> > > I think Tender already shown this in [1].  The same qual is present
> > > twice in the plan.
> > Got it. I suggest making this a separate commit to keep the history
> > clear. Let me share a draft with a test case for the bug fix first.
>
> Yes, I was also thinking about splitting this into two distinct
> commit.  The patch you've attached looks good for me.  I'm going to
> push and backpatch it if no objections.  And let's continue the
> investigation on restrict_infos_logically_equal().

Agree.
And the patch seems to have forgotten to add "Reported by".


-- 
Thanks,
Tender Wang

Commits

  1. Further improve commentary about ChangeVarNodesWalkExpression()

  2. Improve commentary about ChangeVarNodesWalkExpression().

  3. Fix self-join removal to update bare Var references in join clauses

  4. Implement Self-Join Elimination