code: def _GetRowValue(self, query_hash, row, value_name):
      
      keys_name_to_index_map = self._keys_per_query.get(query_hash, None)
      if not keys_name_to_index_map:
        keys_name_to_index_map = {
            name: index for index, name in enumerate(row.keys())}
        self._keys_per_query[query_hash] = keys_name_to_index_map
  
      value_index = keys_name_to_index_map.get(value_name)
  
      # Note that pysqlite does not accept a Unicode string in row['string'] and
      # will raise "IndexError: Index must be int or string".
      return row[value_index]
docs: Retrieves a value from the row.
  
      Args:
        query_hash (int): hash of the query, that uniquely identifies the query
            that produced the row.
        row (sqlite3.Row): row.
        value_name (str): name of the value.
  
      Returns:
        object: value.