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ruleutils.c tries to cope with additions/deletions/renamings of columns in tables referenced by views, by means of adding machine-generated aliases to the printed form of a view when needed to preserve the original semantics. A recent blog post by Marko Tiikkaja pointed out a case I'd missed though: if one input of a join with USING is itself a join, there is nothing to stop the user from adding a column of the same name as the USING column to whichever side of the sub-join didn't provide the USING column. And then there'll be an error when the view is re-parsed, since now the sub-join exposes two columns matching the USING specification. We were catching a lot of related cases, but not this one, so add some logic to cope with it. Back-patch to 9.3, which is the first release that makes any serious attempt to cope with such cases (cf commit 2ffa740be and follow-ons).
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/.