# File lib/innodb/data_dictionary.rb, line 546
  def each_column_in_index_by_name(table_name, index_name)
    unless block_given?
      return enum_for(:each_column_in_index_by_name, table_name, index_name)
    end

    each_field_by_index_name(table_name, index_name) do |record|
      yield column_by_name(table_name, record["COL_NAME"])
    end

    nil
  end