add_index_sort_order

# File activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb, line 962
        def add_index_sort_order(option_strings, column_names, options = {})
          if options.is_a?(Hash) && order = options[:order]
            case order
            when Hash
              column_names.each {|name| option_strings[name] += " #{order[name].upcase}" if order.has_key?(name)}
            when String
              column_names.each {|name| option_strings[name] += " #{order.upcase}"}
            end
          end

          return option_strings
        end