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These were labeled with precedences just to avoid attaching explicit precedences to the productions in which they were the last terminal symbol. Since a terminal symbol precedence marking can affect many other things too, it seems like better practice to attach precedence labels to the productions, and not mark the terminal symbols. Ideally we'd also remove the precedence attached to NULL_P, but it turns out that we are actually depending on that having a precedence higher than POSTFIXOP, else we get a shift/reduce conflict for postfix operators in b_expr. (Which more or less proves my point about these markings having a high risk of unexpected consequences.) For the moment, move NULL_P into the set of keywords grouped with IDENT, so that at least it will act similarly to non-keywords; and document the interaction.
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/.