156475a589
the <@ and @> operators. These are not in fact equivalent to the built-in anyarray operators of the same names, because they have different behavior for empty arrays, namely they don't think empty arrays are contained in anything. That is mathematically wrong, no doubt, but until we can persuade GIN indexes to implement the mathematical definition we should probably not change this. Another reason for not changing it now is that we can't yet ensure the opclasses will be updated correctly in a dump-and-reload upgrade. Per recent discussions.
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/.