Execution example::

  logical_select \
    --logical_table Entries \
    --shard_key created_at \
    --min "2015/07/08 00:00:00" \
    --min_border "include" \
    --max "2015/07/09 00:00:00" \
    --max_border "exclude" \
    --limit 0 \
    --output_columns _id \
    --drilldowns[tag.n_likes].keys tag,n_likes \
    --drilldowns[tag.n_likes].output_columns _nsubrecs,_value.n_likes,_value.tag \
    --drilldowns[tag.n_likes].sort_keys -_nsubrecs,_value.n_likes,_value.tag
  # [
  #   [
  #     0, 
  #     1337566253.89858, 
  #     0.000355720520019531
  #   ], 
  #   [
  #     [
  #       [
  #         3
  #       ], 
  #       [
  #         [
  #           "_id", 
  #           "UInt32"
  #         ]
  #       ]
  #     ], 
  #     {
  #       "tag.n_likes": [
  #         [
  #           3
  #         ], 
  #         [
  #           [
  #             "_nsubrecs", 
  #             "Int32"
  #           ], 
  #           [
  #             "n_likes", 
  #             "UInt32"
  #           ], 
  #           [
  #             "tag", 
  #             "ShortText"
  #           ]
  #         ], 
  #         [
  #           1, 
  #           5, 
  #           "Hello"
  #         ], 
  #         [
  #           1, 
  #           10, 
  #           "Groonga"
  #         ], 
  #         [
  #           1, 
  #           15, 
  #           "Groonga"
  #         ]
  #       ]
  #     }
  #   ]
  # ]
