Can I add a column in catalog table as a superuser

From: ZongtianHou <zongtianhou(at)icloud(dot)com>
To: pgsql-admin(at)lists(dot)postgresql(dot)org
Subject: Can I add a column in catalog table as a superuser
Date: 2018-10-24 09:35:42
Message-ID: 4285ADA2-B55B-41A5-A09D-678687A799EF@icloud.com
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Hi, everyone
I know this is very dangerous, but I do in my private environment, is there a method to add a column in catalog table, like pg_authid?

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