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

@@ -1,22 +1,22 @@
 module Alf
-  module Operator::Relational
-    class Project < Alf::Operator()
-      include Operator::Relational, Operator::Shortcut, Operator::Unary
-    
-      signature do |s|
-        s.argument :attributes, AttrList, []
-        s.option   :allbut,     Boolean,  false, 'Project all but specified attributes?'
-      end
-      
-      protected 
-    
-      # (see Operator::Shortcut#longexpr)
-      def longexpr
-        chain Operator::NonRelational::Compact.new,
-              Operator::NonRelational::Clip.new(@attributes, {:allbut => @allbut}),
-              datasets
-      end
-    
-    end # class Project
-  end # module Operator::Relational
+  module Operator
+    module Relational
+      class Project
+        include Relational, Unary
+
+        signature do |s|
+          s.argument :attributes, AttrList, []
+          s.option   :allbut,     Boolean,  false, 'Project all but specified attributes?'
+        end
+
+        # (see Operator#compile)
+        def compile
+          op = Engine::Clip.new(operand, attributes, allbut)
+          op = Engine::Compact.new(op)
+          op
+        end
+
+      end # class Project
+    end # module Relational
+  end # module Operator
 end # module Alf