Use public method to query defined collations

README.md

@@ -50,6 +50,18 @@ Arel::Nodes::InfixOperation.new(
 Run tests in this repository with `rake`. Migrations are exercised by running them in the dummy application.
 
 ```
+bundle install
+cd test/dummy
+rm -f db/schema.rb && RAILS_ENV=test bundle exec rake db:drop db:create db:migrate
+cd ../../
+bundle exec rake
+```
+
+If you also want to verify running tests on Rails Edge, you can set `BUNDLE_GEMFILE` and run everything again. Otherwise could technically also rely on GitHub Actions to run this for you.
+
+```
+export BUNDLE_GEMFILE=$(pwd)/Gemfile.edge
+bundle install
 cd test/dummy
 rm -f db/schema.rb && RAILS_ENV=test bundle exec rake db:drop db:create db:migrate
 cd ../../

lib/active_record/collation/schema_statements.rb

@@ -18,7 +18,7 @@ def drop_collation(name)
       end
 
       def collations
-        internal_exec_query(collations_sql, 'SCHEMA')
+        select_all(collations_sql, 'SCHEMA')
       end
 
       private

test/active_record/collation/schema_statements_test.rb

@@ -18,6 +18,20 @@ def collation_names
         ApplicationRecord.connection.drop_collation(:misc)
         assert_equal_set(%w[natural_de natural_en], collation_names)
       end
+
+      test 'notifies internals about the executed queries' do
+        queries = []
+        callback = ->(event) { queries << event.payload[:sql] }
+
+        ActiveSupport::Notifications.subscribed(callback, 'sql.active_record') do
+          collation_names
+        end
+
+        assert_includes(
+          queries.last,
+          "pg_namespace.nspname = 'public'"
+        )
+      end
     end
   end
 end