Execution example::

  table_create Thesaurus TABLE_PAT_KEY|KEY_NORMALIZE ShortText
  # [[0, 1337566253.89858, 0.000355720520019531], true]
  column_create Thesaurus synonym COLUMN_VECTOR ShortText
  # [[0, 1337566253.89858, 0.000355720520019531], true]
  load --table Thesaurus
  [
  {"_key": "mroonga", "synonym": ["mroonga", "tritonn", "groonga mysql"]},
  {"_key": "groonga", "synonym": ["groonga", "senna"]}
  ]
  # [[0, 1337566253.89858, 0.000355720520019531], 2]
