Execution example::

  select --table Blog1 --match_columns 'IndexBlog1.index_title * 10 || IndexBlog1.index_message' --query 'Groonga' --output_columns "_id, _score, *"
  # [
  #   [
  #     0, 
  #     1337566253.89858, 
  #     0.000355720520019531
  #   ], 
  #   [
  #     [
  #       [
  #         3
  #       ], 
  #       [
  #         [
  #           "_id", 
  #           "UInt32"
  #         ], 
  #         [
  #           "_score", 
  #           "Int32"
  #         ], 
  #         [
  #           "message", 
  #           "ShortText"
  #         ], 
  #         [
  #           "title", 
  #           "ShortText"
  #         ]
  #       ], 
  #       [
  #         1, 
  #         11, 
  #         "Groonga message", 
  #         "Groonga test"
  #       ], 
  #       [
  #         3, 
  #         10, 
  #         "none", 
  #         "Groonga message"
  #       ], 
  #       [
  #         2, 
  #         1, 
  #         "rakutan eggs 4 - 4 Groonga moritars", 
  #         "baseball result"
  #       ]
  #     ]
  #   ]
  # ]
