DRYed up Column and Table nodes by making them extend from an Identifier node.

Author: Dray Lacy

lib/sql/statement.rb

@@ -251,14 +251,6 @@ class FullJoin < QualifiedJoin
     class FullOuterJoin < QualifiedJoin
     end
 
-    class Table < Node
-      def initialize(name)
-        @name = name
-      end
-
-      attr_reader :name
-    end
-
     class QualifiedColumn < Node
       def initialize(table, column)
         @table = table
@@ -269,14 +261,20 @@ def initialize(table, column)
       attr_reader :column
     end
 
-    class Column < Node
+    class Identifier < Node
       def initialize(name)
         @name = name
       end
 
       attr_reader :name
     end
 
+    class Table < Identifier
+    end
+
+    class Column < Identifier
+    end
+
     class As < Node
       def initialize(value, column)
         @value = value