Akshat-Jain opened a new pull request, #17026:
URL: https://github.com/apache/druid/pull/17026

   ### Description
   
   https://github.com/apache/druid/pull/16885 fixed issues with the following 
type of queries.
   
   ```sql
   -- Query 1
   select countryName, cityName, channel, array_concat_agg(ARRAY['N/A', 
countryName], 10000) over (order by countryName) as c
   from wikipedia
   where countryName in ('Austria', 'Republic of Korea') and (cityName in 
('Horsching', 'Vienna', 'Seoul', 'Jeonju') or cityName is null)
   group by countryName, cityName, channel
   
   -- This query used to give InvalidNullByteException for MSQ engine.
   
   -- Query 2
   select
   countryName, array_concat_agg(ARRAY[countryName], 10000) over () as c1
   from wikipedia where countryName='Guatemala'
   group by countryName
   
   -- This used to give the following incorrect result for both sql-native and 
MSQ engines:
   -- Guatemala [""\t""]
   ```
   
   This PR adds the above queries as drill tests so that the behavior is 
validated against both engines.
   
   <hr>
   
   This PR has:
   
   - [x] been self-reviewed.
   - [ ] added documentation for new or modified features or behaviors.
   - [ ] a release note entry in the PR description.
   - [ ] added Javadocs for most classes and all non-trivial methods. Linked 
related entities via Javadoc links.
   - [ ] added or updated version, license, or notice information in 
[licenses.yaml](https://github.com/apache/druid/blob/master/dev/license.md)
   - [ ] added comments explaining the "why" and the intent of the code 
wherever would not be obvious for an unfamiliar reader.
   - [ ] added unit tests or modified existing tests to cover new code paths, 
ensuring the threshold for [code 
coverage](https://github.com/apache/druid/blob/master/dev/code-review/code-coverage.md)
 is met.
   - [ ] added integration tests.
   - [ ] been tested in a test Druid cluster.
   


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