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When a whole-row Var is reading the result of a subquery, we need it to ignore any "resjunk" columns that the subquery might have evaluated for GROUP BY or ORDER BY purposes. We've hacked this area before, in commit 68e40998d058c1f6662800a648ff1e1ce5d99cba, but that fix only covered whole-row Vars of named composite types, not those of RECORD type; and it was mighty klugy anyway, since it just assumed without checking that any extra columns in the result must be resjunk. A proper fix requires getting hold of the subquery's targetlist so we can actually see which columns are resjunk (whereupon we can use a JunkFilter to get rid of them). So bite the bullet and add some infrastructure to make that possible. Per report from Andrew Dunstan and additional testing by Merlin Moncure. Back-patch to all supported branches. In 8.3, also back-patch commit 292176a118da6979e5d368a4baf27f26896c99a5, which for some reason I had not done at the time, but it's a prerequisite for this change.
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/.