Execution example::

  plugin_register token_filters/stem
  # [[0, 1337566253.89858, 0.000355720520019531], true]
  table_create Memos TABLE_NO_KEY
  # [[0, 1337566253.89858, 0.000355720520019531], true]
  column_create Memos content COLUMN_SCALAR ShortText
  # [[0, 1337566253.89858, 0.000355720520019531], true]
  table_create Terms TABLE_PAT_KEY ShortText \
    --default_tokenizer TokenBigram \
    --normalizer NormalizerAuto \
    --token_filters TokenFilterStem
  # [[0, 1337566253.89858, 0.000355720520019531], true]
  column_create Terms memos_content COLUMN_INDEX|WITH_POSITION Memos content
  # [[0, 1337566253.89858, 0.000355720520019531], true]
  load --table Memos
  [
  {"content": "I develop Groonga"},
  {"content": "I'm developing Groonga"},
  {"content": "I developed Groonga"}
  ]
  # [[0, 1337566253.89858, 0.000355720520019531], 3]
  select Memos --match_columns content --query "develops"
  # [
  #   [
  #     0, 
  #     1337566253.89858, 
  #     0.000355720520019531
  #   ], 
  #   [
  #     [
  #       [
  #         3
  #       ], 
  #       [
  #         [
  #           "_id", 
  #           "UInt32"
  #         ], 
  #         [
  #           "content", 
  #           "ShortText"
  #         ]
  #       ], 
  #       [
  #         1, 
  #         "I develop Groonga"
  #       ], 
  #       [
  #         2, 
  #         "I'm developing Groonga"
  #       ], 
  #       [
  #         3, 
  #         "I developed Groonga"
  #       ]
  #     ]
  #   ]
  # ]
