compare_values_for_order

# File activerecord/lib/active_record/relation/batches.rb, line 414
      def compare_values_for_order(values1, values2, order)
        values1.each_with_index do |element1, index|
          element2 = values2[index]
          direction = order[index]
          comparison = element1 <=> element2
          comparison = -comparison if direction == :desc
          return comparison if comparison != 0
        end

        0
      end