# File lib/dbi/row.rb, line 230
            def dup
                row = self.class.allocate
                row.instance_variable_set :@column_types,  @column_types
                row.instance_variable_set :@convert_types, @convert_types
                row.instance_variable_set :@column_map,    @column_map
                row.instance_variable_set :@column_names,  @column_names
                # this is the only one we actually dup...
                row.instance_variable_set :@arr,           arr = @arr.dup
                row.instance_variable_set :@_dc_obj,       arr
                row
            end