Execution example::

  select Entries --filter 'content *NP "I fast"'      --output_columns content
  # [
  #   [
  #     0,
  #     1337566253.89858,
  #     0.000355720520019531
  #   ],
  #   [
  #     [
  #       [
  #         1
  #       ],
  #       [
  #         [
  #           "content",
  #           "Text"
  #         ]
  #       ],
  #       [
  #         "I started to use Groonga. It's very fast!"
  #       ]
  #     ]
  #   ]
  # ]
  select Entries --filter 'content *NP "I Really"'    --output_columns content
  # [[0,1337566253.89858,0.000355720520019531],[[[0],[["content","Text"]]]]]
  select Entries --filter 'content *NP "also Really"' --output_columns content
  # [
  #   [
  #     0,
  #     1337566253.89858,
  #     0.000355720520019531
  #   ],
  #   [
  #     [
  #       [
  #         1
  #       ],
  #       [
  #         [
  #           "content",
  #           "Text"
  #         ]
  #       ],
  #       [
  #         "I also started to use Mroonga. It's also very fast! Really fast!"
  #       ]
  #     ]
  #   ]
  # ]
