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In some situations the original coding led to corrupting the child AppendRel's subpaths list, effectively adding other members of the parent's list to it. This was usually masked because we never made any further use of the child's list, but given the right combination of circumstances, we could do so. The visible symptom would be a relation getting scanned twice, as in bug #5673 from David Schmitt. Backpatch to 8.2, which is as far back as the risky coding appears. The example submitted by David only fails in 8.4 and later, but I'm not convinced that there aren't any even-more-obscure cases where 8.2 and 8.3 would fail. |
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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. 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 http://www.postgresql.org/download/. For more information look at our web site located at http://www.postgresql.org/.