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I'd omitted this from the grammar in commit c9d529848, figuring that it wasn't worth supporting. However we already have one complaint, so it seems that judgment was wrong. It doesn't require a huge amount of code, so add it back. (I'm still drawing the line at UNION/INTERSECT/EXCEPT though: those'd require an unreasonable amount of grammar refactoring, and the single-result-row restriction makes them near useless anyway.) Also rethink the documentation: this behavior is a property of all pl/pgsql expressions, not just assignments. Discussion: https://postgr.es/m/20210122134106.e94c5cd7@mail.verfriemelt.org
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/.