public inbox for pgsql-bugs@postgresql.org  

help / color / mirror / Atom feed

From: PG Bug reporting form <noreply@postgresql.org>
To: pgsql-bugs@lists.postgresql.org
Cc: ammmkilo@163.com
Subject: BUG #19435: Error: "No relation entry for relid 2" Triggered by Complex Join with Self-Referencing Tables
Date: Mon, 16 Mar 2026 15:51:30 +0000
Message-ID: <19435-3cc1a87f291129f1@postgresql.org> (raw)

The following bug has been logged on the website:

Bug reference:      19435
Logged by:          Hang ammmkilo
Email address:      ammmkilo@163.com
PostgreSQL version: 18.3
Operating system:   Ubuntu 22.04
Description:        

A user encountered an error when attempting to execute a query involving
multiple RIGHT JOIN operations and a NATURAL JOIN on the same table
(pg_table_a). The error message returned was:
[XX000]ERROR: no relation entry for relid 2
This error seems to be an internal one and should not be triggered by users.
It might be a bug.
```sql
DROP TABLE IF EXISTS pg_table_a;

CREATE TABLE pg_table_a (
    id INTEGER PRIMARY KEY,
    col_bool BOOLEAN
);

INSERT INTO pg_table_a (id, col_bool)
VALUES (5, TRUE);

SELECT  1 AS c1
FROM (
    pg_table_a AS tom0
    RIGHT JOIN (
        (pg_table_a AS tom1 NATURAL JOIN pg_table_a AS tom2)
        RIGHT JOIN pg_table_a AS tom3
        ON tom1.col_bool IS NOT NULL
    )
    ON tom1.col_bool
);
```

reply

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Reply to all the recipients using the --to and --cc options:
  reply via email

  To: pgsql-bugs@postgresql.org
  Cc: noreply@postgresql.org, pgsql-bugs@lists.postgresql.org, ammmkilo@163.com
  Subject: Re: BUG #19435: Error: "No relation entry for relid 2" Triggered by Complex Join with Self-Referencing Tables
  In-Reply-To: <19435-3cc1a87f291129f1@postgresql.org>

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

This inbox is served by agora; see mirroring instructions
for how to clone and mirror all data and code used for this inbox