nishantmonu51 commented on a change in pull request #5957: Renamed 'Generic 
Column' -> 'Numeric Column'; Fixed a few resource leaks in processing; Fixed a 
bug in SingleStringInputDimensionSelector; misc refinements
URL: https://github.com/apache/incubator-druid/pull/5957#discussion_r208027936
 
 

 ##########
 File path: 
processing/src/main/java/io/druid/query/aggregation/AggregatorUtil.java
 ##########
 @@ -152,14 +154,14 @@
         condensedAggs.add(aggregatorSpec);
       }
     }
-    return new Pair(condensedAggs, condensedPostAggs);
+    return new Pair<>(condensedAggs, condensedPostAggs);
   }
 
-  public static BaseFloatColumnValueSelector 
makeColumnValueSelectorWithFloatDefault(
+  static BaseFloatColumnValueSelector makeColumnValueSelectorWithFloatDefault(
       final ColumnSelectorFactory metricFactory,
       final ExprMacroTable macroTable,
-      final String fieldName,
-      final String fieldExpression,
+      @Nullable final String fieldName,
+      @Nullable final String fieldExpression,
 
 Review comment:
   Add a comment that only one of fieldName or fieldExpression can be null. 

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