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4ed22e891f
When creating a sort to support a group by, we need to look up the target entry in the target list by the resno using get_tle_by_resno(). This particular code-path didn't check the result prior to attempting to dereference it, while all other callers did. While I can't see a way for this usage of get_tle_by_resno() to fail (you can't ask for a column to be sorted on which isn't included in the group by), it's probably best to check that we didn't end up with a NULL somehow anyway than risk the segfault. I'm willing to back-patch this if others feel it's necessary, but my guess is new features are what might tickle this rather than anything existing. Missing check spotted by the Coverity scanner.
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/.