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This GUC was always intended as a temporary solution to help with finding 9.4-to-9.5 migration issues. Now that all pre-9.5 branches are out of support, and 9.5 will be too before v14 is released, it seems like it's okay to drop it. Doing so allows removal of several hundred lines of poorly-tested code in parse_expr.c, which have been a fertile source of bugs when people did use this. Discussion: https://postgr.es/m/2234320.1607117945@sss.pgh.pa.us
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/.