ccaominh opened a new pull request #9448: Fix superbatch merge last partition 
boundaries
URL: https://github.com/apache/druid/pull/9448
 
 
   ### Description
   
   A bug in the computation for the last parallel merge partition could cause 
an `IndexOutOfBoundsException` or precondition failure due to an empty 
partition.
   
   <hr>
   
   This PR has:
   - [x] been self-reviewed.
   - [x] added Javadocs for most classes and all non-trivial methods. Linked 
related entities via Javadoc links.
   - [x] added comments explaining the "why" and the intent of the code 
wherever would not be obvious for an unfamiliar reader.
   - [x] added unit tests or modified existing tests to cover new code paths.
   

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