1 files changed, 8 insertions, 1 deletions
diff --git a/lib/arel/algebra/relations/operations/join.rb b/lib/arel/algebra/relations/operations/join.rb
index e47d9fa9e0..e9320f28e1 100644
--- a/lib/arel/algebra/relations/operations/join.rb
+++ b/lib/arel/algebra/relations/operations/join.rb
@@ -3,12 +3,19 @@ module Arel
     attributes :relation1, :relation2, :predicates
     deriving :==
     delegate :name, :to => :relation1
-    hash_on :relation1
 
     def initialize(relation1, relation2 = Nil.instance, *predicates)
       @relation1, @relation2, @predicates = relation1, relation2, predicates
     end
 
+    def hash
+      @hash ||= :relation1.hash
+    end
+
+    def eql?(other)
+      self == other
+    end
+
     def attributes
       @attributes ||= (relation1.externalize.attributes +
         relation2.externalize.attributes).collect { |a| a.bind(self) }