not_matching.rb in alf-0.11.0

- old
+ new
@@ -1,45 +1,18 @@
 module Alf
-  module Operator::Relational
-    class NotMatching < Alf::Operator()
-      include Operator::Relational, Operator::Shortcut, Operator::Binary
-      
-      signature do |s|
-      end
-      
-      #
-      # Performs a NotMatching of two relations through a Hash buffer on the 
-      # right one.
-      #
-      class HashBased
-        include Operator, Operator::Binary
-      
-        # (see Operator#_each)
-        def _each
-          seen, key = nil, nil
-          left.each do |left_tuple|
-            seen ||= begin
-              h = Hash.new
-              right.each do |right_tuple|
-                key ||= coerce(left_tuple.keys & right_tuple.keys, AttrList)
-                h[key.project(right_tuple)] = true
-              end
-              key ||= coerce([], AttrList)
-              h
-            end
-            yield(left_tuple) unless seen.has_key?(key.project(left_tuple))
-          end
+  module Operator
+    module Relational
+      class NotMatching
+        include Relational, Binary
+
+        signature do |s|
         end
-        
-      end # class HashBased
-      
-      protected
-      
-      # (see Shortcut#longexpr)
-      def longexpr
-        chain HashBased.new,
-              datasets 
-      end
-      
-    end # class NotMatching
-  end # module Operator::Relational
+
+        # (see Operator#compile)
+        def compile
+          Engine::Semi::Hash.new(left, right, false)
+        end
+
+      end # class NotMatching
+    end # module Relational
+  end # module Operator
 end # module Alf