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If a row that potentially violates a deferred exclusion constraint is HOT-updated later in the same transaction, the exclusion constraint would be reported as violated when the check finally occurs, even if the row(s) the new row originally conflicted with have since been removed. This happened because the wrong TID was passed to check_exclusion_constraint(), causing the live HOT-updated row to be seen as a conflicting row rather than recognized as the row-under-test. Per bug #13148 from Evan Martin. It's been broken since exclusion constraints were invented, 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/.