{"keys":[{"name":"publisher","type":"string","enumValues":["twitter","facebook","yahoo","google","bing","amazon"]},
         {"name":"advertiser","type":"string","enumValues":["starbucks","safeway","mcdonalds","macys","taco bell","walmart","khol's","san diego zoo","pandas","jack in the box","tomatina","ron swanson"]},
         {"name":"location","type":"string","enumValues":["N","LREC","SKY","AL","AK","AZ","AR","CA","CO","CT","DE","FL","GA","HI","ID"]}],
 "values":
  [{"name":"impressions","type":"long","aggregators":["SUM"]},
   {"name":"clicks","type":"long","aggregators":["SUM"]},
   {"name":"cost","type":"double","aggregators":["SUM"]},
   {"name":"revenue","type":"double","aggregators":["SUM"]}],
 "dimensions":
  [{"combination":[]},
   {"combination":["location"]},
   {"combination":["advertiser"]},
   {"combination":["publisher"]},
   {"combination":["advertiser","location"]},
   {"combination":["publisher","location"]},
   {"combination":["publisher","advertiser"]},
   {"combination":["publisher","advertiser","location"]}]
}