text: """
  Get the editions per year.
  """
  
  
  def do_query(archives, config_file=None, logger=None, context=None):
      """
      Iterate through archives and get the title and editions per year
      Returns result of form:
  
      { <YEAR>: [ (title, edition), (title, edition)] }
  
  
      :param archives: RDD of defoe.nls.archive.Archive
      :type archives: pyspark.rdd.PipelinedRDD
      :param config_file: query configuration file (unused)
      :type config_file: str or unicode
      :param logger: logger (unused)
      :type logger: py4j.java_gateway.JavaObject
      :return: Title and editions per year
      :rtype: dict
      """
      # [(year, title, edition)]
      documents = archives.flatMap(
          lambda archive: [(document.year, document.title, document.edition) for document in list(archive)])
      doc_years = documents.map(lambda document: (document[0], (document[1], document[2])))
  
      # [(year, ("title", "edition")), ...]
      # =>
      # [(year, [( title, edition ...),...)]
      result = doc_years \
          .groupByKey() \
          .map(lambda year_context:
               (year_context[0], list(year_context[1]))) \
          .collect()
      return result
  
       
  