I reviewed your patch. Overall it looks good, I didn't find any problems with code. Documentation is in place and clear.
Initial Run ===========
The patch applies cleanly to HEAD (196063d6761). All tests successfully pass.
Comments
===========
1) I noticed that pg_dump changes weren't covered with tests.
2) I assume these error messages may be confusing, especially first one:
-- Fails for an already existing schema to be provided CREATE EXTENSION test_ext_owned_schema SCHEMA test_ext_owned_schema; ERROR: schema "test_ext_owned_schema" already exists -- Fails because a different schema is set in control file CREATE EXTENSION test_ext_owned_schema SCHEMA test_schema; ERROR: extension "test_ext_owned_schema" must be installed in schema "test_ext_owned_schema"
In both cases it's not clear that the extension requires schema ownership. Can hint messages be added there?
