clintropolis opened a new pull request #8014: optimize single string dimension 
expression selector
URL: https://github.com/apache/incubator-druid/pull/8014
 
 
   ### Description
   
   Changes in #7588 made it so that `SingleStringInputDimensionSelector` will 
never be used for multi-value string columns. The "null adjustment" check that 
was done to cause this dimension selector to null out multi-value string 
dimensions is no longer necessary, allowing the implementation to be 
simplified/optimized.
   
   <hr>
   
   This PR has:
   - [x] been self-reviewed.this item if the PR
      doesn't have any relation to concurrency.)
   - [x] added Javadocs for most classes and all non-trivial methods. Linked 
related entities via Javadoc links.

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