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to return NULL, instead of erroring out, if the target object is specified by OID and we can't find that OID in the catalogs. Since these functions operate internally on SnapshotNow rules, there is a race condition when using them in user queries: the query's MVCC snapshot might "see" a catalog row that's already committed dead, leading to a failure when the inquiry function is applied. Returning NULL should generally provide more convenient behavior. This issue has been complained of before, and in particular we are now seeing it in the regression tests due to another recent patch.
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/.