jihoonson commented on a change in pull request #5958: Part 2 of changes for 
SQL Compatible Null Handling
URL: https://github.com/apache/incubator-druid/pull/5958#discussion_r201163578
 
 

 ##########
 File path: common/src/main/java/io/druid/math/expr/ExprEval.java
 ##########
 @@ -99,10 +98,10 @@ public Object value()
     return value;
   }
 
-  public boolean isNull()
 
 Review comment:
   nit: I think it's better to call this method rather than doing `value() == 
null` in call sites.

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