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In general, datatype I/O functions are supposed to be immutable or at worst stable. Some contrib I/O functions were, through oversight, not marked with any volatility property at all, which made them VOLATILE. Since (most of) these functions actually behave immutably, the erroneous marking isn't terribly harmful; but it can be user-visible in certain circumstances, as per a recent bug report from Joe Van Dyk in which a cast to text was disallowed in an expression index definition. To fix, just adjust the declarations in the extension SQL scripts. If we were being very fussy about this, we'd bump the extension version numbers, but that seems like more trouble (for both developers and users) than the problem is worth. A fly in the ointment is that chkpass_in actually is volatile, because of its use of random() to generate a fresh salt when presented with a not-yet-encrypted password. This is bad because of the general assumption that I/O functions aren't volatile: the consequence is that records or arrays containing chkpass elements may have input behavior a bit different from a bare chkpass column. But there seems no way to fix this without breaking existing usage patterns for chkpass, and the consequences of the inconsistency don't seem bad enough to justify that. So for the moment, just document it in a comment. Since we're not bumping version numbers, there seems no harm in back-patching these fixes; at least future installations will get the functions marked correctly.
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/.