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

    https://github.com/apache/spark/pull/22375#discussion_r216868299
  
    --- Diff: 
sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/ExpressionEvalHelper.scala
 ---
    @@ -223,8 +223,8 @@ trait ExpressionEvalHelper extends 
GeneratorDrivenPropertyChecks with PlanTestBa
               }
             } else {
               val lit = InternalRow(expected, expected)
    -          val expectedRow =
    -            UnsafeProjection.create(Array(expression.dataType, 
expression.dataType)).apply(lit)
    +          val dtAsNullable = expression.dataType.asNullable
    +          val expectedRow = UnsafeProjection.create(Array(dtAsNullable, 
dtAsNullable)).apply(lit)
    --- End diff --
    
    Thank you for your comment. Do you think what test is preferable?
    * Successfully pass (we already have these UTs since all UTs have been 
passed)
    * Expectedly failure (In other words, add a function that generated 
incorrect result)


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