merge_single_values

# File activerecord/lib/active_record/relation/merger.rb, line 143
      def merge_single_values
        if relation.from_clause.empty?
          relation.from_clause = other.from_clause
        end
        relation.lock_value ||= other.lock_value

        unless other.create_with_value.blank?
          relation.create_with_value = (relation.create_with_value || {}).merge(other.create_with_value)
        end
      end