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MERGE planning could fail with "variable not found in subplan target list" if the target table is partitioned and all its partitions are excluded at plan time, or in the case where it has no partitions but used to have some. This happened because distribute_row_identity_vars thought it didn't need to make the target table's reltarget list fully valid; but if we generate a join plan then that is required because the dummy Result node's tlist will be made from the reltarget. The same logic appears in distribute_row_identity_vars in v14, but AFAICS the problem is unreachable in that branch for lack of MERGE. In other updating statements, the target table is always inner-joined to any other tables, so if the target is known dummy then the whole plan reduces to dummy, so no join nodes are created. So I'll refrain from back-patching this code change to v14 for now. Per report from Alvaro Herrera. Discussion: https://postgr.es/m/20230328112248.6as34mlx5sr4kltg@alvherre.pgsql
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/.