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When dropping a foreign key constraint with ALTER TABLE DROP CONSTRAINT, we refuse the drop if there are any pending trigger events on the named table; this ensures that we won't remove the pg_trigger row that will be consulted by those events. But we should make the same check for the referenced relation, else we might remove a due-to-be-referenced pg_trigger row for that relation too, resulting in "could not find trigger NNN" or "relation NNN has no triggers" errors at commit. Per bug #14431 from Benjie Gillam. Back-patch to all supported branches. Report: <20161124114911.6530.31200@wrigleys.postgresql.org> |
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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/.