[GitHub] [incubator-druid] vogievetsky opened a new issue #8845: Sampler swallows up `null`s in CSV

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

vogievetsky opened a new issue #8845: Sampler swallows up `null`s in CSV
URL: https://github.com/apache/incubator-druid/issues/8845
 
 
   ### Affected Version
   
   0.16.0 and probably 0.15.0
   
   ### Description
   
   When parsing a CSV in the sampler it totally ignores columns that should return as `null` or `""`
   
   Request:
   
   POST `/druid/indexer/v1/sampler`
   
   Payload:
   
   ```json
   {
     "type": "index",
     "spec": {
       "type": "index",
       "ioConfig": {
         "type": "index",
         "firehose": {
           "type": "inline",
           "data": "Make,Model,Color,Year\nHonda,,,2009\nVW,,,2010"
         }
       },
       "dataSchema": {
         "dataSource": "sample",
         "parser": {
           "type": "string",
           "parseSpec": {
             "format": "csv",
             "timestampSpec": {
               "column": "!!!_no_such_column_!!!",
               "missingValue": "2010-01-01T00:00:00Z"
             },
             "dimensionsSpec": {},
             "hasHeaderRow": true
           }
         }
       }
     },
     "samplerConfig": {
       "numRows": 500,
       "timeoutMs": 15000,
       "cacheKey": "4cadbef182774626b2f2e397ec28e5f8"
     }
   }
   ```
   
   Result:
   
   ```json
   {
     "cacheKey": "4cadbef182774626b2f2e397ec28e5f8",
     "numRowsRead": 2,
     "numRowsIndexed": 2,
     "data": [
       {
         "raw": "Honda,,,2009",
         "parsed": {
           "__time": 1262304000000,
           "Year": "2009",
           "Make": "Honda"
         }
       },
       {
         "raw": "VW,,,2010",
         "parsed": {
           "__time": 1262304000000,
           "Year": "2010",
           "Make": "VW"
         }
       }
     ]
   }
   ```
   
   Where are `Model` / `Color` ?

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