5 files changed, 13 insertions, 5 deletions
diff --git a/lib/arel/relations/operations/group.rb b/lib/arel/relations/operations/group.rb
index 22af2734a6..253c4215b6 100644
--- a/lib/arel/relations/operations/group.rb
+++ b/lib/arel/relations/operations/group.rb
@@ -8,7 +8,7 @@ module Arel
       @groupings = (groupings + (block_given?? [yield(self)] : [])).collect { |g| g.bind(relation) }
     end
 
-    def aggregation?
+    def externalizable?
       true
     end
   end
diff --git a/lib/arel/relations/operations/join.rb b/lib/arel/relations/operations/join.rb
index 243a0289c7..8025db095e 100644
--- a/lib/arel/relations/operations/join.rb
+++ b/lib/arel/relations/operations/join.rb
@@ -39,8 +39,8 @@ module Arel
     end
     
     # TESTME
-    def aggregation?
-      relation1.aggregation? or relation2.aggregation?
+    def externalizable?
+      relation1.externalizable? or relation2.externalizable?
     end
     
     def join?
diff --git a/lib/arel/relations/operations/project.rb b/lib/arel/relations/operations/project.rb
index 2be87fe694..c92a9df5a5 100644
--- a/lib/arel/relations/operations/project.rb
+++ b/lib/arel/relations/operations/project.rb
@@ -12,8 +12,8 @@ module Arel
       @attributes ||= projections.collect { |p| p.bind(self) }
     end
     
-    def aggregation?
-      attributes.any?(&:aggregation?)
+    def externalizable?
+      attributes.any?(&:aggregation?) or relation.externalizable?
     end
   end
 end
 \ No newline at end of file
diff --git a/lib/arel/relations/operations/skip.rb b/lib/arel/relations/operations/skip.rb
index ea5df21f53..930e4c94ea 100644
--- a/lib/arel/relations/operations/skip.rb
+++ b/lib/arel/relations/operations/skip.rb
@@ -2,5 +2,9 @@ module Arel
   class Skip < Compound
     attributes :relation, :skipped
     deriving :initialize, :==
+    
+    def externalizable?
+      true
+    end
   end
 end
 \ No newline at end of file
diff --git a/lib/arel/relations/operations/take.rb b/lib/arel/relations/operations/take.rb
index 095e430417..2fd3fdf635 100644
--- a/lib/arel/relations/operations/take.rb
+++ b/lib/arel/relations/operations/take.rb
@@ -2,5 +2,9 @@ module Arel
   class Take < Compound
     attributes :relation, :taken
     deriving :initialize, :==
+    
+    def externalizable?
+      true
+    end
   end
 end
 \ No newline at end of file