scrawfor edited a comment on issue #9736:
URL: https://github.com/apache/druid/issues/9736#issuecomment-618076075


   @AlexanderSaydakov Using native batch indexer, local Firehose, built the 
sketch over a string column.
   
   Here's the metric spec.
   ```json
    {
             "type": "HLLSketchBuild",
             "name": "unique_views_hll",
             "fieldName": "view_id",
             "lgK": 14,
             "tgtHllType": "HLL_4",
             "round": false
    },
   ```


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