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An extension can already de facto reserve a GUC prefix using EmitWarningsOnPlaceholders(). But this was only checked against settings that exist at the time the extension is loaded (or the extension chooses to call this). No diagnostic is given when a SET command later uses a nonexisting setting with a custom prefix. With this change, EmitWarningsOnPlaceholders() saves the prefixes it reserves in a list, and SET checks when it finds a "placeholder" setting whether it belongs to a reserved prefix and issues a warning in that case. Add a regression test that checks the patch using the "plpgsql" registered prefix. Author: Florin Irion <florin.irion@enterprisedb.com> Discussion: https://www.postgresql.org/message-id/flat/CA+HEvJDhWuuTpGTJT9Tgbdzm4QS4EzPAwDBScWK18H2Q=FVJFw@mail.gmail.com
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/.