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Tom Lane 6b71c925cb Prevent ALTER TYPE/DOMAIN/OPERATOR from changing extension membership.
If recordDependencyOnCurrentExtension is invoked on a pre-existing,
free-standing object during an extension update script, that object
will become owned by the extension.  In our current code this is
possible in three cases:

* Replacing a "shell" type or operator.
* CREATE OR REPLACE overwriting an existing object.
* ALTER TYPE SET, ALTER DOMAIN SET, and ALTER OPERATOR SET.

The first of these cases is intentional behavior, as noted by the
existing comments for GenerateTypeDependencies.  It seems like
appropriate behavior for CREATE OR REPLACE too; at least, the obvious
alternatives are not better.  However, the fact that it happens during
ALTER is an artifact of trying to share code (GenerateTypeDependencies
and makeOperatorDependencies) between the CREATE and ALTER cases.
Since an extension script would be unlikely to ALTER an object that
didn't already belong to the extension, this behavior is not very
troubling for the direct target object ... but ALTER TYPE SET will
recurse to dependent domains, and it is very uncool for those to
become owned by the extension if they were not already.

Let's fix this by redefining the ALTER cases to never change extension
membership, full stop.  We could minimize the behavioral change by
only changing the behavior when ALTER TYPE SET is recursing to a
domain, but that would complicate the code and it does not seem like
a better definition.

Per bug #17144 from Alex Kozhemyakin.  Back-patch to v13 where ALTER
TYPE SET was added.  (The other cases are older, but since they only
affect the directly-named object, there's not enough of a problem to
justify changing the behavior further back.)

Discussion: https://postgr.es/m/17144-e67d7a8f049de9af@postgresql.org
2021-08-17 14:29:22 -04:00
config Remove configure-time thread safety checking (thread_test.c). 2021-07-24 12:16:39 -04:00
contrib Fix failure of btree_gin indexscans with "char" type and </<= operators. 2021-08-10 18:10:29 -04:00
doc doc: \123 and \x12 escapes in COPY are in database encoding. 2021-08-17 10:00:06 +03:00
src Prevent ALTER TYPE/DOMAIN/OPERATOR from changing extension membership. 2021-08-17 14:29:22 -04:00
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README

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:

	https://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
https://www.postgresql.org/download/.  For more information look at our
web site located at https://www.postgresql.org/.