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When creating a nestloop plan for a partitionwise child join, the outer rel's relids are child relids, but PlaceHolderInfo.ph_eval_at is always expressed in terms of the topmost parent rels. As a result, replace_nestloop_params() and identify_current_nestloop_params() failed to recognize that a PlaceHolderVar evaluated at the outer child rel can be supplied as a nestloop param. Instead, the Vars within the PHV's expression were replaced with params, but the outer child rel emits only the PHV, not those bare Vars, leading to "variable not found in subplan target list" errors from setrefs.c. To fix, also include the outer rel's top parent relids in the relid set used for these checks, so that ph_eval_at comparisons are done in terms of parent rels while Var checks continue to work in terms of child rels. On v18 and later, the required-outer set passed to identify_current_nestloop_params() has the same problem: it is in terms of child rels once a parameterized child join path has been reparameterized by an upper child join. With the above fix in place, a PlaceHolderVar that depends on both the outer rel and the parameter source becomes a single NestLoopParam, and that param was never claimed by any nestloop node, leading to "failed to assign all NestLoopParams to plan nodes" errors. To fix, also include the top parents of any child rels in that set. Older branches lack this code path, so they receive only the first change. Back-patch to all supported branches. Bug: #19653 Reported-by: Annie <10215501441@stu.ecnu.edu.cn> Author: Richard Guo <guofenglinux@gmail.com> Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://postgr.es/m/19653-9352cc6ba17b662f@postgresql.org Backpatch-through: 14
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/.