class method self.new

# File activemodel/lib/active_model/indexed_row.rb, line 103
      def initialize(initial_indexes, old_columns, new_columns = old_columns)
        @initial_indexes = initial_indexes

        # Handle duplicate keys
        pairs = new_columns.zip(old_columns).to_h
        new_columns = pairs.keys
        old_columns = pairs.values

        @new_indexes = IndexedRow.build_indexes(new_columns)
        @indexes_to_extract = old_columns.map { |column| @initial_indexes.fetch(column) }
      end