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GIN posting tree page deletion failed to consider whether the target page's left sibling page, or the deletion target itself, was marked as incompletely split. Page deletion finds the target page's left sibling by walking the parent's downlinks, but an incompletely split page's new right half is part of the sibling chain despite having no downlink. Deletion could therefore overwrite the rightlink of the wrong page, disconnecting the split's still-live right half from the sibling chain. Scans would then silently miss tuples from that page. To fix, teach the relevant page deletion path to avoid deleting a posting tree page whose left sibling is marked incompletely split (and to avoid doing so when the target page itself is so marked). This is essentially the same approach used by nbtree page deletion. Claude Code found this problem. The committed test case is a simplified version of the one that it wrote to demonstrate this bug. Author: Peter Geoghegan <pg@bowt.ie> Reviewed-by: Andrey Borodin <x4mmm@yandex-team.ru> Discussion: https://postgr.es/m/CAH2-Wz=sKJcn+OtfVN9rdg+Ps9e4cuQWNP-9t12UE2d8nEG90Q@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/.