ccaominh opened a new pull request #8373: Speed up 
ExpressionSelectors.makeExprEvalSelector
URL: https://github.com/apache/incubator-druid/pull/8373
 
 
   ### Description
   
   Addresses performance bottlenecks observed when running a search query
   with an expression filter and granularity set to none by caching and
   changing streams to for-loops. After changes, the query was observed to
   run 2-3x faster.
   
   Also fixes various IntelliJ inspection warnings.
   
   <hr>
   
   This PR has:
   - [x] been self-reviewed.
   - [x] added comments explaining the "why" and the intent of the code 
wherever would not be obvious for an unfamiliar reader.

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