Execution example::

  select --table Users --query _key:bob --output_columns favorites.posted_by,favorites.comment
  # [
  #   [
  #     0, 
  #     1337566253.89858, 
  #     0.000355720520019531
  #   ], 
  #   [
  #     [
  #       [
  #         1
  #       ], 
  #       [
  #         [
  #           "favorites.posted_by", 
  #           "Users"
  #         ], 
  #         [
  #           "favorites.comment", 
  #           "ShortText"
  #         ]
  #       ], 
  #       [
  #         [
  #           "alice", 
  #           "charlie"
  #         ], 
  #         [
  #           "I've created micro-blog!", 
  #           "@alice @bob I've tried to register!"
  #         ]
  #       ]
  #     ]
  #   ]
  # ]
