Horton

BUG #19097: System catalog modifications are allowed by alter

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From: PG Bug reporting form <noreply@postgresql.org>
To: pgsql-bugs@lists.postgresql.org
Cc: rekgrpth@gmail.com
Date: 2025-10-29T04:41:04Z
Lists: pgsql-bugs

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  1. Refine our definition of what constitutes a system relation.

The following bug has been logged on the website:

Bug reference:      19097
Logged by:          RekGRpth
Email address:      rekgrpth@gmail.com
PostgreSQL version: 18.0
Operating system:   docker alpine
Description:        

```sql
create table pg_catalog.t (i int);
ERROR:  permission denied to create "pg_catalog.t"
DETAIL:  System catalog modifications are currently disallowed.

create table t (i int);
CREATE TABLE

alter table t set schema pg_catalog;
ALTER TABLE

\dS+ t
                                          Table "pg_catalog.t"
 Column |  Type   | Collation | Nullable | Default | Storage | Compression |
Stats target | Description
--------+---------+-----------+----------+---------+---------+-------------+--------------+-------------
 i      | integer |           |          |         | plain   |             |
|
Replica Identity: NOTHING
Access method: heap

drop table pg_catalog.t;
DROP TABLE
```