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

    https://github.com/apache/spark/pull/20756#discussion_r172852988
  
    --- Diff: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/objects/objects.scala
 ---
    @@ -1261,8 +1261,24 @@ case class InitializeJavaBean(beanInstance: 
Expression, setters: Map[String, Exp
       override def children: Seq[Expression] = beanInstance +: 
setters.values.toSeq
       override def dataType: DataType = beanInstance.dataType
     
    -  override def eval(input: InternalRow): Any =
    -    throw new UnsupportedOperationException("Only code-generated 
evaluation is supported.")
    +  override def eval(input: InternalRow): Any = {
    +    val instance = beanInstance.eval(input).asInstanceOf[Object]
    +    if (instance != null) {
    +      setters.foreach { case (setterMethod, fieldExpr) =>
    --- End diff --
    
    Hmmm it should be lenient. Can you try 
`MethodType.methodType(classOf[Object], fieldClass))`?


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