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The GRANTED BY clause in GRANT/REVOKE ROLE has been there since 2005 but was never documented. I'm not sure now whether that was just an oversight or was intentional (given the limited capability of the option). But seeing that pg_dumpall does emit code that uses this option, it seems like not documenting it at all is a bad idea. Also, when we upgraded the syntax to allow CURRENT_USER/SESSION_USER as the privilege recipient, the role form of GRANT was incorrectly not modified to show that, and REVOKE's docs weren't touched at all. Although I'm not that excited about GRANTED BY, the other oversight seems serious enough to justify a back-patch. Discussion: https://postgr.es/m/3070.1581526786@sss.pgh.pa.us
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: https://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. 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 https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.