def dump_extra_diffs(field)
      extra_diffs = diffs_by_field_type(field, TYPE_EXTRA)

      if extra_diffs.length > 0
        header = "Table #{@table_name} has extra #{field}:\n"
        diff_str = extra_diffs.map do |diff|
          dump_single(field, diff[:generator], diff[:elem])
        end.join("\n\t")

        "#{header}\n\t#{diff_str}\n"
      end
    end
def dump_extra_diffs(field)
      extra_diffs = diffs_by_field_type(field, TYPE_EXTRA)

      if extra_diffs.length > 0
        header = "Table #{@table_name} has extra #{field}:\n"
        diff_str = extra_diffs.map do |diff|
          dump_single(field, diff[:generator], diff[:elem])
        end.join("\n\t")

        "#{header}\n\t#{diff_str}\n"
      end
    end
Dumps all diffs that have the given field and are of TYPE_EXTRA.