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

@@ -1,20 +1,18 @@
 module Alf
-  module Operator::Relational
-    class Restrict < Alf::Operator()
-      include Operator::Relational, Operator::Unary
-      
-      signature do |s|
-        s.argument :predicate, TuplePredicate, "true"
-      end
-      
-      protected 
-    
-      # (see Operator#_each)
-      def _each
-        handle = TupleHandle.new
-        each_input_tuple{|t| yield(t) if @predicate.evaluate(handle.set(t)) }
-      end
-  
-    end # class Restrict
-  end # module Operator::Relational
+  module Operator
+    module Relational
+      class Restrict
+        include Relational, Unary
+
+        signature do |s|
+          s.argument :predicate, TuplePredicate, "true"
+        end
+
+        def compile
+          Engine::Filter.new(operand, predicate)
+        end
+
+      end # class Restrict
+    end # module Relational
+  end # module Operator
 end # module Alf