Merge pull request rails#50492 from fatkodima/fix-load_async-query_cache

Fix `load_async` to work with query cache

Author: byroot

activerecord/lib/active_record/future_result.rb

@@ -48,6 +48,7 @@ def flush
     Canceled = Class.new(ActiveRecordError)
 
     delegate :empty?, :to_a, to: :result
+    delegate_missing_to :result
 
     attr_reader :lock_wait
 

activerecord/test/cases/relation/load_async_test.rb

@@ -232,6 +232,13 @@ def test_empty?
       assert_equal false, deferred_posts.empty?
       assert_predicate deferred_posts, :loaded?
     end
+
+    def test_load_async_with_query_cache
+      titles = Post.where(author_id: 1).pluck(:title)
+      Post.cache do
+        assert_equal titles, Post.where(author_id: 1).load_async.pluck(:title)
+      end
+    end
   end
 
   class LoadAsyncNullExecutorTest < ActiveRecord::TestCase