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The executor has thrown errors for negative OFFSET values since 8.4 (see commit bfce56eea45b1369b7bb2150a150d1ac109f5073), but in a moment of brain fade I taught the planner that OFFSET with a constant negative value was a no-op (commit 1a1832eb085e5bca198735e5d0e766a3cb61b8fc). Reinstate the former behavior by only discarding OFFSET with a value of exactly 0. In passing, adjust a planner comment that referenced the ancient behavior. Back-patch to 9.3 where the mistake was introduced.
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/.