# File lib/arel/engines/sql/relations/table.rb, line 61
    def attributes
      return @attributes if @attributes
      if table_exists?
        attrs = columns.collect do |column|
          Sql::Attributes.for(column).new(column, self, column.name.to_sym)
        end
        @attributes = Header.new(attrs)
      else
        Header.new
      end
    end