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When executing a MERGE UPDATE action, if the UPDATE is turned into a cross-partition DELETE then INSERT, do not attempt to invoke AFTER UPDATE ROW triggers, or any of the other post-update actions in ExecUpdateEpilogue(). For consistency with a plain UPDATE command, such triggers should not be fired (and typically fail anyway), and similarly, other post-update actions, such as WCO/RLS checks should not be executed, and might also lead to unexpected failures. Therefore, as with ExecUpdate(), make ExecMergeMatched() return immediately if ExecUpdateAct() reports that a cross-partition update was done, to be sure that no further processing is done for that tuple. Back-patch to v15, where MERGE was introduced. Discussion: https://postgr.es/m/CAEZATCWjBgagyNZs02vgDF0DvASYj-iHTFtXG2-nP3orZhmtcw%40mail.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. 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, and related software, may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.