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Since ALTER TABLE can modify multiple due to inheritance or typed tables which can for example result in TOAST tables being created for some or all of the modified tables while the event trigger is only fired once we cannot rely on the event stack to make sure we get the correct encryption status. Our solution is to be cautious and only modify tables when all tables with storage are either encrypt or not encrypted. If there is a mix we will throw an error. The result of this is also used to properly inform the SMGR of the current encryption status. We apply the same logic to ALTER TYPE for typed tables. A possibility for future improvement would be to limit this check only to commands which recurse down to child tables and/or can create new relfilenodes.
The PostgreSQL contrib tree
---------------------------
This subtree contains porting tools, analysis utilities, and plug-in
features that are not part of the core PostgreSQL system, mainly
because they address a limited audience or are too experimental to be
part of the main source tree. This does not preclude their
usefulness.
User documentation for each module appears in the main SGML
documentation.
When building from the source distribution, these modules are not
built automatically, unless you build the "world" target. You can
also build and install them all by running "make all" and "make
install" in this directory; or to build and install just one selected
module, do the same in that module's subdirectory.
Some directories supply new user-defined functions, operators, or
types. To make use of one of these modules, after you have installed
the code you need to register the new SQL objects in the database
system by executing a CREATE EXTENSION command. In a fresh database,
you can simply do
CREATE EXTENSION module_name;
See the PostgreSQL documentation for more information about this
procedure.