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a multiple (OR'ed) indexscan. It was checking for duplicate tuple->t_data->t_ctid, when what it should be checking is tuple->t_self. The trouble situation occurs when a live tuple has t_ctid not pointing to itself, which can happen if an attempted UPDATE was rolled back. After a VACUUM, an unrelated tuple could be installed where the failed update tuple was, leading to one live tuple's t_ctid pointing to an unrelated tuple. If one of these tuples is fetched by an earlier OR'ed indexscan and the other by a later indexscan, nodeIndexscan.c would incorrectly ignore the second tuple. The bug exists in all 7.4.* and 8.0.* versions, but not in earlier or later branches because this code was only used in those releases. Per trouble report from Rafael Martinez Guerrero.
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 several language bindings, including C, Perl, Python, and Tcl, as well as a JDBC driver. The ODBC and C++ interfaces have been moved to the PostgreSQL Projects Web Site at http://gborg.postgresql.org for separate maintenance. 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. Changes between all PostgreSQL releases are recorded in the file HISTORY. 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 ftp://ftp.postgresql.org/pub/. For more information look at our web site located at http://www.postgresql.org/.