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In READ COMMITTED mode, if a SELECT FOR UPDATE discovers it has to redo WHERE-clause checking on rows that have been updated since the SELECT's snapshot, it invokes EvalPlanQual processing to do that. If this first occurs within a non-first child table of an inheritance tree, the previous coding could accidentally re-return a matching row from an earlier, already-scanned child table. (And, to add insult to injury, I think this could make it miss returning a row that should have been returned, if the updated row that this happens on should still have passed the WHERE qual.) Per report from Kyotaro Horiguchi; the added isolation test is based on his test case. This has been broken for quite awhile, so back-patch to all supported branches. |
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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. 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/.