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

    https://github.com/apache/spark/pull/20756#discussion_r173063007
  
    --- Diff: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/objects/objects.scala
 ---
    @@ -1261,8 +1261,39 @@ 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.")
    +  private lazy val resolvedSetters = {
    +    val ObjectType(beanClass) = beanInstance.dataType
    +    setters.map {
    +      case (name, expr) =>
    +        // Looking for known type mapping first, then using Class attached 
in `ObjectType`.
    +        // Finally also looking for general `Object`-type parameter for 
generic methods.
    +        val paramTypes = 
CallMethodViaReflection.typeMapping.getOrElse(expr.dataType,
    --- End diff --
    
    As #20753, we need to add other types into the mapping.


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