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It's no longer necessary to assign explicit precedences to GENERATED, NULL_P, PRESERVE, or STRIP_P. Actually, we don't need to assign precedence to IDENT either; that was really just there to govern the behavior of target_el's "a_expr IDENT" production, which no longer ends with that terminal. However, it seems like a good idea to continue to do so, because it provides a reference point for a precedence level that we can assign to other unreserved keywords that lack a natural precedence level. Research by Peter Eisentraut and John Naylor; comment rewrite by me. Discussion: https://postgr.es/m/38ca86db-42ab-9b48-2902-337a0d6b8311@2ndquadrant.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/.