Execution example::

  table_create --name Blog2 --flags TABLE_HASH_KEY --key_type ShortText
  # [[0, 1337566253.89858, 0.000355720520019531], true]
  column_create --table Blog2 --name title --flags COLUMN_SCALAR --type ShortText
  # [[0, 1337566253.89858, 0.000355720520019531], true]
  column_create --table Blog2 --name message --flags COLUMN_SCALAR --type ShortText
  # [[0, 1337566253.89858, 0.000355720520019531], true]
  table_create --name IndexBlog2 --flags TABLE_PAT_KEY|KEY_NORMALIZE --key_type ShortText --default_tokenizer TokenBigram
  # [[0, 1337566253.89858, 0.000355720520019531], true]
  column_create --table IndexBlog2 --name index_blog --flags COLUMN_INDEX|WITH_POSITION|WITH_SECTION --type Blog2 --source title,message
  # [[0, 1337566253.89858, 0.000355720520019531], true]
  load --table Blog2
  [
  {"_key":"grn1","title":"groonga test","message":"groonga message"},
  {"_key":"grn2","title":"baseball result","message":"rakutan eggs 4 - 4 groonga moritars"},
  {"_key":"grn3","title":"groonga message","message":"none"}
  ]
  # [[0, 1337566253.89858, 0.000355720520019531], 3]
