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In commit 1bc16a946008a7cbb33a9a06a7c6765a807d7f59 I added a minor optimization to drop the component variables of a GROUP BY expression from the target list computed at the aggregation level of a query, if those Vars weren't referenced elsewhere in the tlist. However, I overlooked that the window-function planning code would deconstruct such expressions and thus need to have access to their component variables. Fix it to not do that. While at it, I removed the distinction between volatile and nonvolatile window partition/order expressions: the code now computes all of them at the aggregation level. This saves a relatively expensive check for volatility, and it's unclear that the resulting plan isn't better anyway. Per bug #7535 from Louis-David Mitterrand. Back-patch to 9.2.
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/.