Execution example::

  > select --table User --query friends:@tomo --output_columns _key,username
  [[0,1317212839.60442,0.000260617],[[[5],[["_key","ShortText"],["username","ShortText"]],["ken","健作"],["taro","ぐるんが太郎"],["jiro","ぐるんが次郎"],["moritapo","森田"],["hana","花子"]]]]
  > select --table User --query friends:@jiro --output_columns _key,username
  [[0,1317212839.80577,0.000253172],[[[3],[["_key","ShortText"],["username","ShortText"]],["ken","健作"],["taro","ぐるんが太郎"],["hana","花子"]]]]