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This lets later stages have access to the transformed expression; in particular it allows DDL-deparsing code during event triggers to pass the transformed expression to ruleutils.c, so that the complete command can be deparsed. This shuffles the timing of the transform calls a bit: previously, nothing was transformed during parse analysis, and only the RELKIND_RELATION case was being handled during execution. After this patch, all expressions are transformed during parse analysis (including those for relkinds other than RELATION), and the error for other relation kinds is thrown only during execution. So we do more work than before to reject some bogus cases. That seems acceptable.
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/.