Execution example::

  > select --table Comments --query comment:@羽田 --filter 'geo_in_circle(location,"127975798x502919856",20000)' --output_columns posted_by.name,comment --drilldown hash_tags,posted_by
  [
    [
      0, 
      1335519661.00659, 
      0.000471353530883789
    ], 
    [
      [
        [
          1
        ], 
        [
          [
            "posted_by.name", 
            "ShortText"
          ], 
          [
            "comment", 
            "ShortText"
          ]
        ], 
        [
          "グニャラくん", 
          "groonga開発合宿のため羽田空港に来ました！ #groonga #travel"
        ]
      ], 
      [
        [
          2
        ], 
        [
          [
            "_key", 
            "ShortText"
          ], 
          [
            "_nsubrecs", 
            "Int32"
          ]
        ], 
        [
          "groonga", 
          1
        ], 
        [
          "travel", 
          1
        ]
      ], 
      [
        [
          1
        ], 
        [
          [
            "_key", 
            "ShortText"
          ], 
          [
            "_nsubrecs", 
            "Int32"
          ]
        ], 
        [
          "tasukuchan", 
          1
        ]
      ]
    ]
  ]