Re: BUG #19097: System catalog modifications are allowed by alter

Kirill Reshke <reshkekirill@gmail.com> writes:
> reproduced here on v13, v16, v18 and HEAD. Looks like we need to teach
> ExecAlterObjectSchemaStmt to respect allow_system_table_mods GUC.

allow_system_table_mods has never been intended to be bulletproof,
only to slow down careless superusers.  I'm not especially concerned
about whether there are paths it doesn't cover.

            regards, tom lane