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Since 9.0, the count parameter has only limited the number of tuples actually returned by the executor. It doesn't affect the behavior of INSERT/UPDATE/DELETE unless RETURNING is specified, because without RETURNING, the ModifyTable plan node doesn't return control to execMain.c for each tuple. And we only check the limit at the top level. While this behavioral change was unintentional at the time, discussion of bug #6572 led us to the conclusion that we prefer the new behavior anyway, and so we should just adjust the docs to match rather than change the code. Accordingly, do that. Back-patch as far as 9.0 so that the docs match the code in each branch. |
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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/.