lib/alf/operator/relational/extend.rb in alf-0.10.1 vs lib/alf/operator/relational/extend.rb in alf-0.11.0

@@ -1,24 +1,19 @@
 module Alf
-  module Operator::Relational
-    class Extend < Alf::Operator()
-      include Operator::Relational, Operator::Transform
-  
-      signature do |s|
-        s.argument :ext, TupleComputation, {}
-      end
-      
-      protected 
-    
-      # (see Operator#_prepare)
-      def _prepare
-        @handle = TupleHandle.new
-      end
-  
-      # (see Operator::Transform#_tuple2tuple)
-      def _tuple2tuple(tuple)
-        tuple.merge @ext.evaluate(@handle.set(tuple))
-      end
-  
-    end # class Extend
-  end # module Operator::Relational
+  module Operator
+    module Relational
+      class Extend
+        include Relational, Unary
+
+        signature do |s|
+          s.argument :ext, TupleComputation, {}
+        end
+
+        # (see Operator#compile)
+        def compile
+          Engine::SetAttr.new(operand, ext)
+        end
+
+      end # class Extend
+    end # module Relational
+  end # module Operator
 end # module Alf