cyrilou242 opened a new issue, #11503:
URL: https://github.com/apache/pinot/issues/11503

   ## Problem Observed
   Context:  
   `DISTINCTCOUNT` can only apply on one column. This is an expected behaviour. 
 
   `COUNT(DISTINCT(col))` is rewritten to `DISTINCTCOUNT(col)`. This is the 
expected behaviour.
   
   Problem:  
   `COUNT(DISTINCT col1, col2)` should not be supported and throw a syntax 
error.
   Currently, it is accepted and rewritten to `DISTINCTCOUNT(col1)`. Notice 
`col2` is lost.
   
   
   ## How to reproduce
   ```
   select 
   COUNT(DISTINCT DestStateName),
   COUNT(DISTINCT DestStateName, OriginAirportID)
   from airlineStats limit 10
   ```
   
   Returns
   ```
   |distinctcount(DestStateName)|distinctcount(DestStateName)|
   |           53               |           53               |
   ```
   
   ## Expected behaviour: 
   COUNT(DISTINCT col1, col2) should throw a SQL syntax error.


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