jihoonson commented on issue #11544:
URL: https://github.com/apache/druid/issues/11544#issuecomment-893215130


   Hmm, were there lots of values per group-by key by any chance? What does 
this query return? (BTW, I copied the time filter from your comment, but is 
that correct? It is identical to `__time = '2021-06-01'`)
   
   ```sql
   SELECT COALESCE("mytable".country, '_') AS country, count(*)
   FROM "mytable"
   WHERE ("mytable".service_code = 'top')
   AND __time >= '2021-06-01' AND __time <= '2021-06-01'
   GROUP BY COALESCE("mytable".country, '_')
   ```


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