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The way that columns are added to a view is by calling AlterTableInternal with special subtype AT_AddColumnToView; but that subtype is changed to AT_AddColumnRecurse by ATPrepAddColumn. This has no visible effect in the current code, since views cannot have inheritance children (thus the recursion step is a no-op) and adding a column to a view is executed identically to doing it to a table; but it does make a difference for future event trigger code keeping track of commands, because the current situation leads to confusing the case with a normal ALTER TABLE ADD COLUMN. Fix the problem by passing a flag to ATPrepAddColumn to prevent it from changing the command subtype. The event trigger code can then properly ignore the subcommand. (We could remove the call to ATPrepAddColumn, since views are never typed, and there is never a need for recursion, which are the two conditions that are checked by ATPrepAddColumn; but it seems more future-proof to keep the call in place.)
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/.