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

    https://github.com/apache/spark/pull/7537#discussion_r35064084
  
    --- Diff: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/complexTypeCreator.scala
 ---
    @@ -122,5 +157,23 @@ case class CreateNamedStruct(children: 
Seq[Expression]) extends Expression with
         InternalRow(valExprs.map(_.eval(input)): _*)
       }
     
    +  override def genCode(ctx: CodeGenContext, ev: GeneratedExpressionCode): 
String = {
    +    val rowClass = 
"org.apache.spark.sql.catalyst.expressions.GenericMutableRow"
    --- End diff --
    
    can we use `classOf[...].getName` so we get a compiler error if this class 
is removed?


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