Schema#load implementation suggestion

bigquery-schema-load.rb

class Schema
  def load source
    ...

    add_fields_to_schema(schema, source_fields)

    self
  end

  def add_fields_to_schema schema, fields
    fields.each do |field|
      column = schema.send(
          :add_field,
          field["name"],
          field["type"],
          mode:        field["mode"],
          description: field["description"]
      )

      next unless field["type"] == "RECORD"

      add_fields_to_schema(column, field["fields"])
    end
  end
end