{
     "queryType": "groupBy",
     "dataSource": "randSeq",
     "granularity": "all",
     "dimensions": [],
     "aggregations":[
     { "type": "count", "name": "rows"},
     { "type": "doubleSum", "fieldName": "events", "name": "e"},
     { "type": "doubleSum", "fieldName": "outColumn", "name": "randomNumberSum"}
     ],
     "postAggregations":[
     {  "type":"arithmetic",
        "name":"avg_random",
        "fn":"/",
        "fields":[ {"type":"fieldAccess","name":"randomNumberSum","fieldName":"randomNumberSum"},
                   {"type":"fieldAccess","name":"rows","fieldName":"rows"} ]}
     ],
     "intervals":["2012-10-01T00:00/2020-01-01T00"]
 }