[GitHub] sh-learn opened a new issue #6089: Use Filtered Aggregator return null but expect 0

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

sh-learn opened a new issue #6089: Use Filtered Aggregator return null but expect 0
URL: https://github.com/apache/incubator-druid/issues/6089
 
 
   I recently encountered a problem with druid. When using the filter aggregator to count the total number of times a condition is met, since there is no data that satisfies the filter condition, it returns null when LongSum is performed, but expects to return 0. I don't know if there is a solution? The version of druid used is 0.10.1.
   
   filtered aggregator:
        {
   	"type": "filtered",
   	"filter": {
   		"type": "selector",
   		"dimension": "xxx",
   		"value": "yyy"
   	},
   	"aggregator": {
   		"type": "longSum",
   		"name": "value",
   		"fieldName": "zzz"
   	}
       }
   result:
   {
     "version" : "v1",
     "timestamp" : "2018-08-01T00:00:00.000+08:00",
     "event" : {
       "value" : null
    }
   

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