実行例 ::

  > select --table Site --limit 0 --drilldown country --drilldown_sortby _nsubrecs --drilldown_limit 2 --drilldown_offset 2
  [[0,1294292443.94881,0.000324308],[[[9],[["_id","UInt32"],["_key","ShortText"],["title","ShortText"],["location","WGS84GeoPoint"],["links","Site"],["link","Site"],["domain","SiteDomain"],["country","SiteCountry"]]],[[5],[["_key","ShortText"],["_nsubrecs","Int32"]],["usa",2],["china",2]]]]
  