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Since 82a4edabd27 we can bulk extend relations. The bulk relation extension logic has a heuristic component. Normally the heurstic does not trigger in the occasionally-failing test case, as the relation is only extended once. But with very small shared_buffers the limits for the number of buffers pinned at once prevent the extension from happening at once. With the second "bulk" extension, the heuristic kicks in, and the relation ends up one block bigger. That's ok from a correctness perspective, but changes the results of the test query due to one additional block. We discussed a few more expansive fixes, but for now have decided to avoid this by making the table a bit smaller. Author: Heikki Linnakangas <hlinnaka@iki.fi> Reported-by: Discussion: https://postgr.es/m/29c74104-210b-ef39-2522-27a6aa7a704f@iki.fi Discussion: https://postgr.es/m/20230916000011.2ugpkkkp7bpp4cfh@awork3.anarazel.de Backpatch: 16-, where the new relation extension logic was added
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/.