b60653bc0b
Since PostgreSQL 9.0, we've emitted a warning message when an operator named => is created, because the SQL standard now reserves that token for another use. But we've also shipped such an operator with hstore. Use of the function hstore(text, text) has been recommended in preference to =>(text, text). Per discussion, it's now time to take the next step and stop shipping the operator. This will allow us to prohibit the use of => as an operator name in a future release if and when we wish to support the SQL standard use of this token. The release notes should mention this incompatibility. Patch by me, reviewed by David Wheeler, Dimitri Fontaine and Tom Lane.
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/.