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Formerly, any member of a role could change the role's comment, as of course could superusers; but holders of CREATEROLE privilege could not, unless they were also members. This led to the odd situation that a CREATEROLE holder could create a role but then could not comment on it. It also seems a bit dubious to let an unprivileged user change his own comment, let alone those of group roles he belongs to. So, change the rule to be "you must be superuser to comment on a superuser role, or hold CREATEROLE to comment on non-superuser roles". This is the same as the privilege check for creating/dropping roles, and thus fits much better with the rule for other object types, namely that only the owner of an object can comment on it. In passing, clean up the documentation for COMMENT a little bit. Per complaint from Owen Jacobson and subsequent discussion.
PostgreSQL Database Management System ===================================== This directory contains the source code distribution of the PostgreSQL database management system. PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings. PostgreSQL has many language interfaces, many of which are listed here: http://www.postgresql.org/download See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Changes between all PostgreSQL releases are recorded in the file HISTORY. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at http://www.postgresql.org/download/. For more information look at our web site located at http://www.postgresql.org/.