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operator. The result depends only on the two input operators and the proof direction (imply or refute), so it's easy to cache. This provides a very large savings in cases such as Sergey Konoplev's long NOT-IN-list example, where predtest spends all its time repeatedly figuring out that the same pair of operators cannot be used to prove anything. (But of course the O(N^2) behavior still catches up with you eventually.) I'm not convinced it buys a whole lot when constraint_exclusion isn't turned on, but it's not a lot of added code so we might as well cache all the time.
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/.