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Fix a bug during MERGE if a cross-partition update is attempted on a partitioned table with a BEFORE DELETE ROW trigger that returns NULL, to prevent the update. This would cause an error to be thrown, or an assert failure in an assert-enabled build. This was an oversight in 9321c79c86, which failed to properly distinguish a DELETE prevented by a trigger from one prevented by a concurrent update. Fix by having ExecDelete() return the TM_Result status to ExecCrossPartitionUpdate(), so that it can distinguish the two cases, and make ExecCrossPartitionUpdate() return the TM_Result status to ExecUpdateAct(), so that it can return the correct status from a concurrent update. In addition, ensure that the command tag is correctly updated by having ExecMergeMatched() pass canSetTag to ExecUpdateAct(), rather than passing false, so that it updates the command tag if it does a cross-partition update, making this code path in ExecMergeMatched() consistent with ExecUpdate(). Per bug #18238 from Alexander Lakhin. Back-patch to v15, where MERGE was introduced. Dean Rasheed, reviewed by Richard Guo and Jian He. Discussion: https://postgr.es/m/18238-2f2bdc7f720180b9%40postgresql.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. 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/.