MeihanLi opened a new issue, #13305:
URL: https://github.com/apache/pinot/issues/13305

   we found in Pinot 1.1, PERCENTILEEST throws NPE in MultiStage Engine. Does 
anyone know if this is already fixed in master?
   
   example query:
   ```
   WITH sub AS (select deviceOS, count(1) as total_count from userAttributes 
group by 1 limit 100000),
   subx AS (select deviceOS, count(1) as total_count from userAttributes group 
by 1 limit 100000),
   union_table AS (select deviceOS, total_count from sub UNION ALL select 
deviceOS, total_count from subx)
   select deviceOS, percentile(total_count, 50) from union_table group by 
deviceOS 
   ```
   
   <img width="889" alt="image" 
src="https://github.com/apache/pinot/assets/42751784/c55cded4-80a7-4ab5-a60a-59544697cf4b";>
   


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