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When a MERGE's target table is the parent of an inheritance tree, any INSERT actions insert into the parent table using ModifyTableState's rootResultRelInfo. However, there are two bugs in the way this is initialized: 1. ExecInitMerge() incorrectly uses a different ResultRelInfo entry from ModifyTableState's resultRelInfo array to build the insert projection, which may not be compatible with rootResultRelInfo. 2. ExecInitModifyTable() does not fully initialize rootResultRelInfo. Specifically, ri_WithCheckOptions, ri_WithCheckOptionExprs, ri_returningList, and ri_projectReturning are not initialized. This can lead to crashes, or incorrect query results due to failing to check WCO's or process the RETURNING list for INSERT actions. Fix both these bugs in ExecInitMerge(), noting that it is only necessary to fully initialize rootResultRelInfo if the MERGE has INSERT actions and the target table is a plain inheritance parent. Backpatch to v15, where MERGE was introduced. Reported-by: Andres Freund <andres@anarazel.de> Author: Dean Rasheed <dean.a.rasheed@gmail.com> Reviewed-by: Jian He <jian.universality@gmail.com> Reviewed-by: Tender Wang <tndrwang@gmail.com> Discussion: https://postgr.es/m/4rlmjfniiyffp6b3kv4pfy4jw3pciy6mq72rdgnedsnbsx7qe5@j5hlpiwdguvc Backpatch-through: 15
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/.