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Instead of playing cute games with pathkeys, just build a direct representation of the intended sub-select, and feed it through query_planner to get a Path for the index access. This is a bit slower than 9.1's previous method, since we'll duplicate most of the overhead of query_planner; but since the whole optimization only applies to rather simple single-table queries, that probably won't be much of a problem in practice. The advantage is that we get to do the right thing when there's a partial index that needs the implicit IS NOT NULL clause to be usable. Also, although this makes planagg.c be a bit more closely tied to the ordering of operations in grouping_planner, we can get rid of some coupling to lower-level parts of the planner. Per complaint from Marti Raudsepp. |
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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/.