Execution example::

  > table_create --name User --flags TABLE_HASH_KEY --key_type ShortText
  [[0,1335519630.85121,0.00020289421081543],true]
  > column_create --table User --name username --flags COLUMN_SCALAR --type ShortText
  [[0,1335519631.05176,0.00130391120910645],true]
  > column_create --table User --name friends --flags COLUMN_VECTOR --type User
  [[0,1335519631.25402,0.000970840454101562],true]
  > column_create --table User --name index_friends --flags COLUMN_INDEX --type User --source friends
  [[0,1335519631.45581,0.00640487670898438],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"]}
  > ]
  [[0,1335519631.6631,1.60283184051514],6]