Github user viirya commented on a diff in the pull request:

    https://github.com/apache/spark/pull/18818#discussion_r132119567
  
    --- Diff: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/predicates.scala
 ---
    @@ -465,7 +475,7 @@ abstract class BinaryComparison extends BinaryOperator 
with Predicate {
         }
       }
     
    -  protected lazy val ordering = 
TypeUtils.getInterpretedOrdering(left.dataType)
    +  protected lazy val ordering: Ordering[Any] = 
TypeUtils.getInterpretedOrdering(left.dataType)
    --- End diff --
    
    The acceptable types in `TypeUtils.getInterpretedOrdering` are less than 
`RowOrdering.isOrderable`. It only accepts `AtomicType`, `ArrayType` and 
`StructType`.
    
    `NullType`, `UserDefinedType` can cause problems.


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