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Previously, to update an extension you had to produce both a version-update script and a new base installation script. It's become more and more obvious that that's tedious, duplicative, and error-prone. This patch attempts to improve matters by allowing the new base installation script to be omitted. CREATE EXTENSION will install a requested version if it can find a base script and a chain of update scripts that will get there. As in the existing update logic, shorter chains are preferred if there's more than one possibility, with an arbitrary tie-break rule for chains of equal length. Also adjust the pg_available_extension_versions view to show such versions as installable. While at it, refactor the code so that CASCADE processing works for extensions requested during ApplyExtensionUpdates(). Without this, addition of a new requirement in an updated extension would require creating a new base script, even if there was no other reason to do that. (It would be easy at this point to add a CASCADE option to ALTER EXTENSION UPDATE, to allow the same thing to happen during a manually-commanded version update, but I have not done that here.) Tom Lane, reviewed by Andres Freund Discussion: <20160905005919.jz2m2yh3und2dsuy@alap3.anarazel.de>
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. 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/.