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We had a request to provide a way to test at compile time for the availability of the new pipeline features. More generally, it seems like a good idea to provide a way to test via #ifdef for all new libpq API features. People have been using the version from pg_config.h for that; but that's more likely to represent the server version than the libpq version, in the increasingly-common scenario where they're different. It's safer if libpq-fe.h itself is the source of truth about what features it offers. Hence, establish a policy that starting in v14 we'll add a suitable feature-is-present macro to libpq-fe.h when we add new API there. (There doesn't seem to be much point in applying this policy retroactively, but it's not too late for v14.) Tom Lane and Alvaro Herrera, per suggestion from Boris Kolpackov. Discussion: https://postgr.es/m/boris.20210617102439@codesynthesis.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/.