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Unlogged tables have no data on a standby, so reading one there must fail. SELECT and COPY (SELECT ...) TO already report a clear error, but COPY with a table name read the table directly and failed with a low-level error instead: ERROR: could not open file "base/5/16384": No such file or directory Check for this case in COPY TO and report the same error as SELECT. On v19 and later, also check each partition when copying from a partitioned table, so that an unlogged partition is reported too. Backpatch to all supported versions, since the low-level error looks like data corruption. Author: Jim Jones <jim.jones@uni-muenster.de> Reviewed-by: Zsolt Parragi <zsolt.parragi@percona.com> Reviewed-by: Masahiko Sawada <sawada.mshk@gmail.com> Discussion: https://postgr.es/m/b6d71815-d362-4579-bf07-73eca01aee6d@uni-muenster.de 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/.