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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.
Code coverage for pg_tde: 
Percona Server for PostgreSQL
Percona Server for PostgreSQL is a free, enhanced, fully compatible, open source, drop-in replacement for the PostgreSQL Database Management System with enterprise-grade features. It requires no changes to PostgreSQL applications or code.
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