Execution example::

  table_create LooseItems TABLE_HASH_KEY ShortText --normalizer NormalizerAuto
  # [[0, 1337566253.89858, 0.000355720520019531], true]
  column_create LooseItems label COLUMN_SCALAR ShortText
  # [[0, 1337566253.89858, 0.000355720520019531], true]
  column_create LooseItems readings COLUMN_VECTOR Readings
  # [[0, 1337566253.89858, 0.000355720520019531], true]
  column_create Readings loose_items_index COLUMN_INDEX LooseItems readings
  # [[0, 1337566253.89858, 0.000355720520019531], true]
  load --table LooseItems
  [
  {"_key": "日本",     "label": "日本",     "readings": ["ニホン", "ニッポン"]},
  {"_key": "ローマ字", "label": "ローマ字", "readings": ["ローマジ"]},
  {"_key": "漢字",     "label": "漢字",     "readings": ["カンジ"]},
  {"_key": "Nihon",    "label": "日本",     "readings": []}
  ]
  # [[0, 1337566253.89858, 0.000355720520019531], 4]
