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ReorderBufferProcessTXN() opens every relation referenced by a TRUNCATE change. When RelationIsLogicallyLogged() returns false, it skips the relation without releasing the reference acquired by RelationIdGetRelation(). Looking at the in-core code paths building XLOG_HEAP_TRUNCATE records, no relation OIDs would be included if they do not satisfy RelationIsLogicallyLogged(). One pattern that could go through is if a table is switched to SET UNLOGGED, but that would not be reachable in practice as the decoding happens after a historical snapshot is taken, so the relation should still be valid. This is a defense-in-depth measure in practice, and we tend to be careful about how Relations are handled when sending changes to output plugins, so backpatch all the way down. Author: Chao Li <li.evan.chao@gmail.com> Reviewed-by: Xuneng Zhou <xunengzhou@gmail.com> Discussion: https://postgr.es/m/7DD65D03-3B5A-43B2-99AD-8E6AF5372BAB@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/.