Github user lw-lin commented on a diff in the pull request:

    https://github.com/apache/spark/pull/14698#discussion_r76177037
  
    --- Diff: 
sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/ExpressionEvalHelper.scala
 ---
    @@ -136,7 +136,7 @@ trait ExpressionEvalHelper extends 
GeneratorDrivenPropertyChecks {
         // some expression is reusing variable names across different 
instances.
         // This behavior is tested in ExpressionEvalHelperSuite.
         val plan = generateProject(
    -      GenerateUnsafeProjection.generate(
    +      UnsafeProjection.create(
    --- End diff --
    
    yea.
    
    `GenerateUnsafeProjection.generate` here was not able to use unsafe-backed 
data structure because it's `Create*Struct`.
    `UnsafeProjection.create`, however, does use unsafe-backed data structure 
(UnsafeRow, UnsafeArrayData, ...) so that this test is valid.


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