08dd23cec7
Phil Sorber reported that a rewriting ALTER TABLE within an extension update script failed, because it creates and then drops a placeholder table; the drop was being disallowed because the table was marked as an extension member. We could hack that specific case but it seems likely that there might be related cases now or in the future, so the most practical solution seems to be to create an exception to the general rule that extension member objects can only be dropped by dropping the owning extension. To wit: if the DROP is issued within the extension's own creation or update scripts, we'll allow it, implicitly performing an "ALTER EXTENSION DROP object" first. This will simplify cases such as extension downgrade scripts anyway. No docs change since we don't seem to have documented the idea that you would need ALTER EXTENSION DROP for such an action to begin with. Also, arrange for explicitly temporary tables to not get linked as extension members in the first place, and the same for the magic pg_temp_nnn schemas that are created to hold them. This prevents assorted unpleasant results if an extension script creates a temp table: the forced drop at session end would either fail or remove the entire extension, and neither of those outcomes is desirable. Note that this doesn't fix the ALTER TABLE scenario, since the placeholder table is not temp (unless the table being rewritten is). Back-patch to 9.1. |
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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/.