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The Incremental Sort had a couple issues, resulting in leaking memory during rescans, possibly triggering OOM. The code had a couple of related flaws: 1. During rescans, the sort states were reset but then also set to NULL (despite the comment saying otherwise). ExecIncrementalSort then sees NULL and initializes a new sort state, leaking the memory used by the old one. 2. Initializing the sort state also automatically rebuilt the info about presorted keys, leaking the already initialized info. presorted_keys was also unnecessarily reset to NULL. Patch by James Coleman, based on patches by Laurenz Albe and Tom Lane. Backpatch to 13, where Incremental Sort was introduced. Author: James Coleman, Laurenz Albe, Tom Lane Reported-by: Laurenz Albe, Zu-Ming Jiang Backpatch-through: 13 Discussion: https://postgr.es/m/b2bd02dff61af15e3526293e2771f874cf2a3be7.camel%40cybertec.at Discussion: https://postgr.es/m/db03c582-086d-e7cd-d4a1-3bc722f81765%40inf.ethz.ch
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/.