cryptoe opened a new pull request, #14171:
URL: https://github.com/apache/druid/pull/14171

   If Either exception was fed into another either nested exceptions were 
thrown which becomes hard to debug. 
   Added a new `EitherException` to break the nesting. 
   
   This change resulted in much cleaner logs on the MSQ side
   Logs went from :
   
   ```
   java.lang.RuntimeException: java.lang.RuntimeException: 
java.lang.RuntimeException: 
org.apache.druid.query.groupby.epinephelinae.UnexpectedMultiValueDimensionException:
 Encountered multi-value dimension [tags] that cannot be processed with 'gro
   ```
   to  
   
   ```
   org.apache.druid.java.util.common.EitherException: 
org.apache.druid.query.groupby.epinephelinae.UnexpectedMultiValueDimensionException:
 Encountered multi-valu
   ``` 
   


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