Execution example::

  table_create --name User --flags TABLE_HASH_KEY --key_type ShortText
  # [[0,1337566253.89858,0.000355720520019531],true]
  column_create --table User --name username --flags COLUMN_SCALAR --type ShortText
  # [[0,1337566253.89858,0.000355720520019531],true]
  column_create --table User --name friends --flags COLUMN_VECTOR --type User
  # [[0,1337566253.89858,0.000355720520019531],true]
  column_create --table User --name index_friends --flags COLUMN_INDEX --type User --source friends
  # [[0,1337566253.89858,0.000355720520019531],true]
  load --table User
  [
  {"_key":"ken","username":"健作","friends":["taro","jiro","tomo","moritapo"]}
  {"_key":"moritapo","username":"森田","friends":["ken","tomo"]}
  {"_key":"taro","username":"ぐるんが太郎","friends":["jiro","tomo"]}
  {"_key":"jiro","username":"ぐるんが次郎","friends":["taro","tomo"]}
  {"_key":"tomo","username":"トモちゃん","friends":["ken","hana"]}
  {"_key":"hana","username":"花子","friends":["ken","taro","jiro","moritapo","tomo"]}
  ]
  # [[0,1337566253.89858,0.000355720520019531],6]
