1 files changed, 5 insertions, 0 deletions
diff --git a/lib/arel/nodes/select_statement.rb b/lib/arel/nodes/select_statement.rb
index 122f6275fe..50fef776f6 100644
--- a/lib/arel/nodes/select_statement.rb
+++ b/lib/arel/nodes/select_statement.rb
@@ -8,6 +8,11 @@ module Arel
         @cores = cores
         @limit = nil
       end
+
+      def initialize_copy other
+        super
+        @cores = @cores.map { |o| o.clone }
+      end
     end
   end
 end