wuyunfeng edited a comment on issue #1529: [CALCITE-3442] In ElasticSearch 
adapter, set `stored_fields = _none_` to prohibit FetchPhase get involved 
URL: https://github.com/apache/calcite/pull/1529#issuecomment-546847713
 
 
   @danny0405 
   
   Elasticsearch X-Pack SQL translate API also can prove this:
   
   ```
   POST /_sql/translate
   {
       "query": "SELECT k1,count(*) FROM test GROUP BY k1,k2",
       "fetch_size": 100
   }
   ```
   the result:
   
   
   ```
   {
      "size": 0,
      "_source": false,
      "stored_fields": "_none_",
      "aggregations": {
         "groupby": {
            "composite": {
               "size": 100,
               "sources": [
                  {
                     "612": {
                        "terms": {
                           "field": "k1",
                           "missing_bucket": true,
                           "order": "asc"
                        }
                     }
                  },
                  {
                     "613": {
                        "terms": {
                           "field": "k2",
                           "missing_bucket": true,
                           "order": "asc"
                        }
                     }
                  }
               ]
            }
         }
      }
   }
   
   ```

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