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Commitce146621ensures that ERROR is raised if a session tries to read pages of another session's temp table. But there is a corner case where the other session's temp table is empty -- in this case the INSERT command bypasses our checks and executes without any errors. Such behavior is inconsistent and erroneous: it leaves an invalid buffer in the temp buffers pool. Since the buffer was created for another session's temp table, we get an error "no such file or directory" when trying to flush it. This commit fixes it by adding a RELATION_IS_OTHER_TEMP check in the relation-extension path. Backpatch to 16, because it is the first release after31966b151e, which introduced a separate local relation extension function ExtendBufferedRelLocal(), which lacks of RELATION_IS_OTHER_TEMP() check. As this fix introduces more checks to 013_temp_obj_multisession.pl, backpatch the whole test script to 16. Discussion: https://postgr.es/m/CAJDiXgiX2XZBHDNo%2BzBbvku%2BtchrUurvPRaN1_40mEQ1_sG90g%40mail.gmail.com Author: Daniil Davydov <3danissimo@gmail.com> Reviewed-by: Jim Jones <jim.jones@uni-muenster.de> Reviewed-by: Imran Zaheer <imran.zhir@gmail.com> Reviewed-by: ZizhuanLiu X-MAN <44973863@qq.com> Backpatch-through: 16
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/.