7392eed7c2
Commit 2ed5b87f96d473962ec5230fd820abfeaccb2069 introduced a bug in mark/restore, in an attempt to optimize repeated restores to the same page. This caused an assertion failure during a merge join which fed directly from an index scan, although the impact would not be limited to that case. Revert the bad chunk of code from that commit. While investigating this bug it was discovered that a particular "paranoia" set of the mark position field would not prevent bad behavior; it would just make it harder to diagnose. Change that into an assertion, which will draw attention to any future problem in that area more directly. Backpatch to 9.5, where the bug was introduced. Bug #14169 reported by Shinta Koyanagi. Preliminary analysis by Tom Lane identified which commit caused the bug.
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: http://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 http://www.postgresql.org/download/. For more information look at our web site located at http://www.postgresql.org/.