b23cd185fd
Up to now we have allowed manual creation of an ON SELECT rule on a table to convert it into a view. That was never anything but a horrid, error-prone hack though. pg_dump used to rely on that behavior to deal with cases involving circular dependencies, where a dependency loop could be broken by separating the creation of a view from installation of its ON SELECT rule. However, we changed pg_dump to use CREATE OR REPLACE VIEW for that in commit d8c05aff5 (which was later back-patched as far as 9.4), so there's not a good argument anymore for continuing to support the behavior. The proximate reason for axing it now is that we found that the new statistics code has failure modes associated with the relkind change caused by this behavior. We'll patch around that in v15, but going forward it seems like a better idea to get rid of the need to support relkind changes. Discussion: https://postgr.es/m/CALDaNm2yXz+zOtv7y5zBd5WKT8O0Ld3YxikuU3dcyCvxF7gypA@mail.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/.