7b94e99960
currtid() and currtid2() are an undocumented set of functions whose sole known user is the Postgres ODBC driver, able to retrieve the latest TID version for a tuple given by the caller of those functions. As used by Postgres ODBC, currtid() is a shortcut able to retrieve the last TID loaded into a backend by passing an OID of 0 (magic value) after a tuple insertion. This is removed in this commit, as it became obsolete after the driver began using "RETURNING ctid" with inserts, a clause supported since Postgres 8.2 (using RETURNING is better for performance anyway as it reduces the number of round-trips to the backend). currtid2() is still used by the driver, so this remains around for now. Note that this function is kept in its original shape for backward compatibility reasons. Per discussion with many people, including Andres Freund, Peter Eisentraut, Álvaro Herrera, Hiroshi Inoue, Tom Lane and myself. Bump catalog version. Discussion: https://postgr.es/m/20200603021448.GB89559@paquier.xyz
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/.