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When cloning extended statistics via CREATE TABLE ... LIKE ... INCLUDING STATISTICS, stxkeys holds attribute numbers from the source (parent) table, but get_attname() was being called with the child relation's OID. If the parent has dropped columns, the child's attribute numbers are renumbered sequentially and no longer match, so the lookup either returns the wrong column name (silent corruption) or errors out when the attnum does not exist in the child. Fix it by remapping the parent attnum through attmap before the lookup, consistent with how expression statistics are already handled a few lines below. Add a regression test covering both manifestations: a 3-column parent where the stale attnum refers to no child column (cache-lookup error), and a 4-column parent where the stale attnum silently refers to the wrong child column. Author: Julien Tachoires <julmon@gmail.com> Reviewed-by: Srinath Reddy Sadipiralla <srinath2133@gmail.com> Discussion: https://postgr.es/m/20260415105718.tomuncfbmlt67oel@poseidon.home.virt 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/.