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Formerly, this function would always return "true" for an appendrel child relation, because it would think that the appendrel parent was a potential join target for the child. In principle that should only lead to some inefficiency in planning, but fuzz testing by Andreas Seltenreich disclosed that it could lead to "could not find pathkey item to sort" planner errors in odd corner cases. Specifically, we would think that all columns of a child table's multicolumn index were interesting pathkeys, causing us to generate a MergeAppend path that sorts by all the columns. However, if any of those columns weren't actually used above the level of the appendrel, they would not get added to that rel's targetlist, which would result in being unable to resolve the MergeAppend's sort keys against its targetlist during createplan.c. Backpatch to 9.3. In older versions, columns of an appendrel get added to its targetlist even if they're not mentioned above the scan level, so that the failure doesn't occur. It might be worth back-patching this fix to older versions anyway, but I'll refrain for the moment. |
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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. 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/.