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The change made by commit 906bfcad7 means that if you're writing a parenthesized column list in UPDATE ... SET, but that column list is only one column, you now need to write ROW(expression) on the righthand side, not just a parenthesized expression. This was an intentional change for spec compatibility and potential future expansion of the possibilities for the RHS, but I'd neglected to document it as a compatibility issue, figuring that hardly anyone would bother with parenthesized syntax for a single target column. I was wrong, as shown by questions from Justin Pryzby, Adam Brusselback, and others. Move the release note item into the compatibility section and point out the behavior change for a single target column. Discussion: https://postgr.es/m/CAMjNa7cDLzPcs0xnRpkvqmJ6Vb6G3EH8CYGp9ZBjXdpFfTz6dg@mail.gmail.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/.