1 files changed, 14 insertions, 0 deletions
diff --git a/lib/arel/engines/sql/predicates.rb b/lib/arel/engines/sql/predicates.rb
index 7e195c2605..b84c183c1d 100644
--- a/lib/arel/engines/sql/predicates.rb
+++ b/lib/arel/engines/sql/predicates.rb
@@ -5,6 +5,20 @@ module Arel
     end
   end
 
+  class CompoundPredicate < Binary
+    def to_sql(formatter = nil)
+      "(#{operand1.to_sql(formatter)} #{predicate_sql} #{operand2.to_sql(formatter)})"
+    end
+  end
+
+  class Or < CompoundPredicate
+    def predicate_sql; "OR" end
+  end
+
+  class And < CompoundPredicate
+    def predicate_sql; "AND" end
+  end
+
   class Equality < Binary
     def predicate_sql
       operand2.equality_predicate_sql