gianm commented on a change in pull request #10613:
URL: https://github.com/apache/druid/pull/10613#discussion_r558131456



##########
File path: 
processing/src/main/java/org/apache/druid/query/dimension/DimensionSpec.java
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@@ -70,6 +71,11 @@ default MultiValueDimensionVectorSelector 
decorate(MultiValueDimensionVectorSele
     throw new UOE("DimensionSpec[%s] cannot vectorize", getClass().getName());
   }
 
+  default VectorObjectSelector decorate(VectorObjectSelector selector)

Review comment:
       I think this makes sense, so if we're going to keep this method, that'd 
all be good stuff to add to the javadoc. This method does need one because it's 
not obvious from the signature how it works, what its preconditions are, and 
what kinds of objects will come out of the selector it returns.




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