2e2a392de3
According to the source history, the internal format of line data type has changed, but various functions working with it did were not updated and thus were producing wrong results. This patch addresses various such issues, in particular: * Reject invalid specification A=B=0 on receive * Reject same points on line_construct_pp() * Fix perpendicular operator when negative values are involved * Avoid division by zero on perpendicular operator * Fix intersection and distance operators when neither A nor B are 1 * Return NULL for closest point when objects are parallel * Check whether closest point of line segments is the intersection point * Fix closest point of line segments being on the wrong segment Aside from handling those issues, the patch also aims to make operators more symmetric and less sen to precision loss. The EPSILON interferes with even minor changes, but the least we can do is applying it to both sides of the operators equally. Author: Emre Hasegeli Reviewed-by: Tomas Vondra Discussion: https://www.postgresql.org/message-id/CAE2gYzxF7-5djV6-cEvqQu-fNsnt%3DEqbOURx7ZDg%2BVv6ZMTWbg%40mail.gmail.com
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: https://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 https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.