Execution example::

  select \
   --table Books \
   --output_columns _key,character._key,character.age,character.roles
  # [
  #   [
  #     0, 
  #     1337566253.89858, 
  #     0.000355720520019531
  #   ], 
  #   [
  #     [
  #       [
  #         1
  #       ], 
  #       [
  #         [
  #           "_key", 
  #           "ShortText"
  #         ], 
  #         [
  #           "character._key", 
  #           "ShortText"
  #         ], 
  #         [
  #           "character.age", 
  #           "UInt8"
  #         ], 
  #         [
  #           "character.roles", 
  #           "ShortText"
  #         ]
  #       ], 
  #       [
  #         "Alice's Adventure in Wonderland", 
  #         "alice", 
  #         7, 
  #         [
  #           "adventurer", 
  #           "younger-sister"
  #         ]
  #       ]
  #     ]
  #   ]
  # ]
