ankitsultana commented on issue #11866:
URL: https://github.com/apache/pinot/issues/11866#issuecomment-1788111598

   The query Christina shared is valid though.
   
   I tested this in Postgres with this table:
   
   |row-num | id | nm | cnt
   |-- | -- | -- | --
   |1 | a- | name | 0
   |2 | a | -name | 1
   
   Query:
   ```
   select concat(id, nm, '-') from testing_groupby group by id, nm
   ```
   
   Output:
   ```
   a-name-
   a-name-
   ```
   
   Also, Christina mentioned that the query in the original post is working in 
Multistage Engine but it is not working in V1 Engine. (I didn't verify this 
myself)


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