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find_var_for_subquery_tle() searches a subquery rel's targetlist for a Var referencing a given subquery output column, and asserted that any Var it finds there belongs to that rel. That does not hold for an appendrel child. set_append_rel_size() builds the child's targetlist by translating the parent's, and as noted there the result can contain arbitrary expressions. In particular, when a member of a LATERAL UNION ALL subquery is pulled up and its output is a lateral reference, the translated expression is a Var of the laterally referenced rel. If the child is itself a subquery with sorted paths, convert_subquery_pathkeys() would trip the Assert. In non-assert builds, the function went on to compare such a Var's varattno with the subquery column's resno, and so could match a Var of an unrelated rel. To fix, ignore Vars that do not belong to the subquery rel, the same way set_rel_width() already does. Also correct the adjacent comment, which claimed that the only non-Var entries are placeholders. Back-patch to all supported branches. Author: Richard Guo <guofenglinux@gmail.com> Reviewed-by: shihao zhong <zhong950419@gmail.com> Discussion: https://postgr.es/m/CAMbWs48fFiPi7Q5yJCoM_nAs47zd5XgvPHd9nZyM_ewq+k_jpQ@mail.gmail.com 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/.