4 files changed, 15 insertions, 18 deletions
diff --git a/lib/arel/relations/aggregation.rb b/lib/arel/relations/aggregation.rb
index 4c4ef0dfed..d18ef014fa 100644
--- a/lib/arel/relations/aggregation.rb
+++ b/lib/arel/relations/aggregation.rb
@@ -19,13 +19,18 @@ module Arel
     end
     
     def ==(other)
-      self.class == other.class and self.relation == other.relation
+      self.class    == other.class and
+      self.relation == other.relation
     end
   end
   
   class Relation
     def externalize
-      aggregation?? Aggregation.new(self) : self
+      @externalized ||= aggregation?? Aggregation.new(self) : self
+    end
+    
+    def aggregation?
+      false
     end
   end
 end
 \ No newline at end of file
diff --git a/lib/arel/relations/join.rb b/lib/arel/relations/join.rb
index 92bbbd5626..2dd3555bac 100644
--- a/lib/arel/relations/join.rb
+++ b/lib/arel/relations/join.rb
@@ -35,9 +35,8 @@ module Arel
         relation2.externalize.attributes).collect { |a| a.bind(self) }
     end
     
-    # XXX
     def selects
-      (relation1.externalize.selects).collect { |s| s.bind(self) }
+      relation1.externalize.selects
     end
     
     # XXX
@@ -60,4 +59,10 @@ module Arel
       true
     end
   end
+  
+  class Relation
+    def join?
+      false
+    end
+  end
 end
 \ No newline at end of file
diff --git a/lib/arel/relations/nil.rb b/lib/arel/relations/nil.rb
index e78ebe6088..714b11cc2a 100644
--- a/lib/arel/relations/nil.rb
+++ b/lib/arel/relations/nil.rb
@@ -1,16 +1,11 @@
 module Arel
   class Nil < Relation
-    # XXX
-    include Recursion::BaseCase
-    
     def table_sql(formatter = nil); '' end
     def relation_for(attribute); nil end
     def name; '' end
-    def to_s; '' end
-    
+
     def ==(other)
       self.class == other.class
     end
   end
-  
 end
 \ No newline at end of file
diff --git a/lib/arel/relations/recursion.rb b/lib/arel/relations/recursion.rb
index 7507613a12..1333d7ff57 100644
--- a/lib/arel/relations/recursion.rb
+++ b/lib/arel/relations/recursion.rb
@@ -13,14 +13,6 @@ module Arel
       def relation_for(attribute)
         self[attribute] && self
       end
-      
-      def join?
-        false
-      end
-      
-      def aggregation?
-        false
-      end
     end
   end
 end
 \ No newline at end of file