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d5a4b69c3a
In this case we generate two PathKey references to the expression (one for DISTINCT and one for ORDER BY) and they really need to refer to the same EquivalenceClass. However get_eclass_for_sort_expr was being overly paranoid and creating two different EC's. Correct behavior is to use the SortGroupRef index to decide whether two references to volatile expressions that are equal() (ie textually equivalent) should be considered the same. Backpatch to 8.4. Possibly this should be changed in 8.3 as well, but I'll refrain in the absence of evidence of a visible failure in that branch. Per bug #5049. |
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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/.