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Back in 2003 we had a discussion about how to decide which casts to dump. At the time pg_dump really only considered an object's containing schema to decide what to dump (ie, dump whatever's not in pg_catalog), and so we chose a complicated idea involving whether the underlying types were to be dumped (cf commit a6790ce85752b67ad994f55fdf1a450262ccc32e). But users are allowed to create casts between built-in types, and we failed to dump such casts. Let's get rid of that heuristic, which has accreted even more ugliness since then, in favor of just looking at the cast's OID to decide if it's a built-in cast or not. In passing, also fix some really ancient code that supposed that it had to manufacture a dependency for the cast on its cast function; that's only true when dumping from a pre-7.3 server. This just resulted in some wasted cycles and duplicate dependency-list entries with newer servers, but we might as well improve it. Per gripes from a number of people, most recently Greg Sabino Mullane. Back-patch to all supported branches.
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/.