[GitHub] [incubator-druid] shizhengchao commented on issue #7970: Consider adding support for a pre-transform filter for transform specs

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shizhengchao commented on issue #7970: Consider adding support for a pre-transform filter for transform specs
URL: https://github.com/apache/incubator-druid/issues/7970#issuecomment-506205490
 
 
   > This creates a situation where I need to add a field I do not care about to the Data Source's dim
   
   i don't think so,because I had used it like this. i can give you my json task:
   
   ```json
   {
     "type": "kafka",
     "dataSchema": {
       "dataSource": "demo",
       "parser": {
         "type": "string",
         "parseSpec": {
           "format": "json",
           "timestampSpec": {
             "column": "timestamp",
             "format": "yyyy-MM-dd HH:mm:ss"
           },
           "dimensionsSpec": {
             "dimensions": [
               "user_id",
               "express_company_id"
             ]
           }
         }
       },
       "metricsSpec": [
         {
           "name": "count",
           "type": "count"
         },
         {
           "name": "drop_count",
           "fieldName": "metric_count",
           "type": "longSum"
         },
         {
           "name": "freight",
           "fieldName": "freight",
           "type": "longSum"
         }
       ],
       "granularitySpec": {
         "type": "uniform",
         "segmentGranularity": "month",
         "queryGranularity": "minute",
         "rollup": true
       },
       "transformSpec": {
         "filter": {
           "type": "selector",
           "dimension": "send_status",
           "value": "101"
         }
       }
     },
     "tuningConfig": {
       "type": "kafka",
       "intermediatePersistPeriod" : "PT10M"
     },
     "ioConfig": {
       "topic": "SendForDruid",
       "consumerProperties": {
         "bootstrap.servers": "localhost:9092"
       },
       "useEarliestOffset": true,
       "taskCount": 1,
       "replicas": 1,
       "taskDuration": "P1D"
     }
   }
   ```
   in my `transformSpec`, i can use filter fields that are not in the dimensions list.

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