lib/bmg/operator/join.rb in bmg-0.18.2 vs lib/bmg/operator/join.rb in bmg-0.18.3

@@ -23,9 +23,10 @@
       attr_reader :on, :options
 
     public
 
       def each
+        return to_enum unless block_given?
         index = Hash.new
         right.each_with_object(index) do |t, index|
           key = tuple_project(t, on)
           index[key] ||= []
           index[key] << t