[GitHub] [incubator-druid] ighack opened a new issue #8147: I don't understand {"name": "latencyMs", "type": "doubleSum", "fieldName": "latencyMs"}

[GitBox <gi...@apache.org>]

ighack opened a new issue #8147: I don't understand {"name": "latencyMs", "type": "doubleSum", "fieldName": "latencyMs"}
URL: https://github.com/apache/incubator-druid/issues/8147
 
 
   
   I need
   select avg(latencyMs),min(latencyMs),sum(latencyMs) from mytable
   
   so make config
   I can only do that
   
    "metricsSpec": [
          {"name": "views", "type": "count"},
          {"name": "latencyMs", "type": "doubleSum", "fieldName": "latencyMs"}
     ]
   
   or
   I should do this
   
    "metricsSpec": [
          {"name": "views", "type": "count"},
          {"name": "latencyMs", "type": "doubleSum", "fieldName": "latencyMs"},
          {"name": "latencyMs", "type": "doubleMin", "fieldName": "latencyMs"},
     ]
   
   and what about avg?
   
   "metricsSpec": [
          {"name": "rows", "type": "count"},
          {"name": "latencyMs_SUM", "type": "doubleSum", "fieldName": "latencyMs"},
          {"name": "latencyMs_MIN", "type": "doubleMin", "fieldName": "latencyMs"},
     ],
      "aggregations" : [{
       {"type" : "count", "name" : "rows"},
       {"type" : "doubleSum", "name" : "latencyMs_SUM", "fieldName" : "latencyMs_SUM"}
     }],
     "postAggregations" : [{
       "type"   : "arithmetic",
       "name"   : "latencyMs_AVG",
       "fn"     : "/",
       "fields" : [
         { "type" : "fieldAccess", "fieldName" : "latencyMs_SUM" },
         { "type" : "fieldAccess", "name" : "rows", "fieldName" : "rows" }
       ]
     }]
   is that right?
   
   why do I use aggregations?
   If I don't make aggregations,can I also "select avg(latencyMs),min(latencyMs),sum(latencyMs) from mytable"

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