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Previously, ALTER SYSTEM failed if the target GUC wasn't present in the session's GUC hashtable. That is a reasonable behavior for core (single-part) GUC names, and for custom GUCs for which we have loaded an extension that's reserved the prefix. But it's unnecessarily restrictive otherwise, and it also causes inconsistent behavior: you can "ALTER SYSTEM SET foo.bar" only if you did "SET foo.bar" earlier in the session. That's fairly silly. Hence, refactor things so that we can execute ALTER SYSTEM even if the variable doesn't have a GUC hashtable entry, as long as the name meets the custom-variable naming requirements and does not have a reserved prefix. (It's safe to do this even if the variable belongs to an extension we currently don't have loaded. A bad value will at worst cause a WARNING when the extension does get loaded.) Also, adjust GRANT ON PARAMETER to have the same opinions about whether to allow an unrecognized GUC name, and to throw the same errors if not (it previously used a one-size-fits-all message for several distinguishable conditions). By default, only a superuser will be allowed to do ALTER SYSTEM SET on an unrecognized name, but it's possible to GRANT the ability to do it. Patch by me, pursuant to a documentation complaint from Gavin Panella. Arguably this is a bug fix, but given the lack of other complaints I'll refrain from back-patching. Discussion: https://postgr.es/m/2617358.1697501956@sss.pgh.pa.us Discussion: https://postgr.es/m/169746329791.169914.16613647309012285391@wrigleys.postgresql.org
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/.