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This patch fixes the other major compatibility-breaking limitation of SPGiST, that it didn't store anything for null values of the indexed column, and so could not support whole-index scans or "x IS NULL" tests. The approach is to create a wholly separate search tree for the null entries, and use fixed "allTheSame" insertion and search rules when processing this tree, instead of calling the index opclass methods. This way the opclass methods do not need to worry about dealing with nulls. Catversion bump is for pg_am updates as well as the change in on-disk format of SPGiST indexes; there are some tweaks in SPGiST WAL records as well. Heavily rewritten version of a patch by Oleg Bartunov and Teodor Sigaev. (The original also stored nulls separately, but it reused GIN code to do so; which required undesirable compromises in the on-disk format, and would likely lead to bugs due to the GIN code being required to work in two very different contexts.)
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/.