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This error message was written with only ON SELECT rules in mind, but since then we also made RETURNING-clause targetlists go through the same logic. This means that you got a rather off-topic error message if you tried to add a rule with RETURNING to a table having dropped columns. Ideally we'd just support that, but some preliminary investigation says that it might be a significant amount of work. Seeing that Nicklas Avén's complaint is the first one we've gotten about this in the ten years or so that the code's been like that, I'm unwilling to put much time into it. Instead, improve the error report by issuing a different message for RETURNING cases, and revise the associated comment based on this investigation. Discussion: 1456176604.17219.9.camel@jordogskog.no
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/.