41e461d36f
Arrange for any problems with pre-existing settings to be reported as WARNING not ERROR, so that we don't undesirably abort the loading of the incoming add-on module. The bad setting is just discarded, as though it had never been applied at all. (This requires a change in the API of set_config_option. After some thought I decided the most potentially useful addition was to allow callers to just pass in a desired elevel.) Arrange to restore the complete stacked state of the variable, rather than cheesily reinstalling only the active value. This ensures that custom GUCs will behave unsurprisingly even when the module loading operation occurs within nested subtransactions that have changed the active value. Since a module load could occur as a result of, eg, a PL function call, this is not an unlikely scenario.
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/.