[GitHub] [incubator-druid] vogievetsky opened a new issue #8784: stringFirst/stringLast do not work correctly at ingest time

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

vogievetsky opened a new issue #8784: stringFirst/stringLast do not work correctly at ingest time
URL: https://github.com/apache/incubator-druid/issues/8784
 
 
   ### Affected Version
   
   Druid 0.16.0
   
   ### Description
   
   It might be related to `https://github.com/apache/incubator-druid/issues/7243` I am not sure
   
   Ingested data with this spec in a quickstart cluster:
   
   ```json
   {
     "type": "index_parallel",
     "ioConfig": {
       "type": "index_parallel",
       "firehose": {
         "type": "http",
         "uris": [
           "https://druid.apache.org/data/wikipedia.json.gz"
         ]
       }
     },
     "tuningConfig": {
       "type": "index_parallel"
     },
     "dataSchema": {
       "dataSource": "wikipedia-test",
       "granularitySpec": {
         "type": "uniform",
         "segmentGranularity": "DAY",
         "queryGranularity": "HOUR",
         "rollup": true
       },
       "parser": {
         "type": "string",
         "parseSpec": {
           "format": "json",
           "timestampSpec": {
             "column": "timestamp",
             "format": "iso"
           },
           "dimensionsSpec": {
             "dimensions": [
               "channel",
               "cityName",
               "comment",
               "countryIsoCode",
               "countryName",
               "flags",
               "isAnonymous",
               "isMinor",
               "isNew",
               "isRobot",
               "isUnpatrolled",
               "namespace",
               "page",
               "regionIsoCode",
               "regionName"
             ]
           }
         }
       },
       "metricsSpec": [
         {
           "name": "count",
           "type": "count"
         },
         {
           "name": "sum_added",
           "type": "longSum",
           "fieldName": "added"
         },
         {
           "name": "sum_commentLength",
           "type": "longSum",
           "fieldName": "commentLength"
         },
         {
           "name": "sum_deleted",
           "type": "longSum",
           "fieldName": "deleted"
         },
         {
           "name": "sum_metroCode",
           "type": "longSum",
           "fieldName": "metroCode"
         },
         {
           "name": "sum_deltaBucket",
           "type": "longSum",
           "fieldName": "deltaBucket"
         },
         {
           "name": "sum_delta",
           "type": "longSum",
           "fieldName": "delta"
         },
         {
           "name": "test",
           "type": "stringFirst",
           "fieldName": "user"
         }
       ]
     }
   }
   ```
   
   And got:
   
   ![image](https://user-images.githubusercontent.com/177816/67827409-2df6ea00-fa8d-11e9-917c-37c526f0c931.png)
   
   Also that column's data type gets reported as `OTHER`
   
   ![image](https://user-images.githubusercontent.com/177816/67827454-4b2bb880-fa8d-11e9-8f2f-ac443028b1ff.png)
   
   

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