ArnavBalyan opened a new pull request, #11722:
URL: https://github.com/apache/pinot/pull/11722

   bugfix for Gapfill functions where lowecase datatypes with certain aggregate 
functions do not work (causing null ptr exceptions). 
   
   - Pinot natively 
[supports](https://docs.pinot.apache.org/users/user-guide-query/query-syntax/supported-aggregations)
 lower case for aggregate functions. However this functionality breaks when 
used with Gapfill.
   
   - This is because the dataschema returned by the server is always uppercase. 
There is a mismatch between the column names causing NPE (when attempting to 
map the column alias with the fetched data). 
   
   - Added a check to handle lowercase data schemas when creating response of 
gapfill queries.


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