exclude ORDER BY clause for exists? (#28699)

activerecord/lib/active_record/relation/finder_methods.rb

@@ -383,7 +383,7 @@ def find_with_associations
       end
 
       def construct_relation_for_exists(relation, conditions)
-        relation = relation.except(:select, :distinct)._select!(ONE_AS_ONE).limit!(1)
+        relation = relation.except(:select, :distinct, :order)._select!(ONE_AS_ONE).limit!(1)
 
         case conditions
         when Array, Hash

activerecord/test/cases/finder_test.rb

@@ -208,6 +208,11 @@ def test_exists_with_order_and_distinct
     assert_equal true, Topic.order(:id).distinct.exists?
   end
 
+  # Ensure +exists?+ runs without an error by excluding order value.
+  def test_exists_with_order
+    assert_equal true, Topic.order("invalid sql here").exists?
+  end
+
   def test_exists_with_joins
     assert_equal true, Topic.joins(:replies).where(replies_topics: { approved: true }).order("replies_topics.created_at DESC").exists?
   end