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immutable, but that is wrong in general because the cast from the polymorphic argument to text could be stable or even volatile. Mark them volatile for safety. In the typical case where the cast isn't volatile, the planner will deduce the correct expression volatility after inlining the function, so performance is not lost. The just-committed fix in CREATE INDEX also ensures this won't break any indexing cases that ought to be allowed. Per discussion, I'm not bumping catversion for this change, as it doesn't seem critical enough to force an initdb on beta testers.
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/.