Github user JihongMA commented on the pull request:

    https://github.com/apache/spark/pull/9003#issuecomment-149997989
  
    Seth, no need to implement the old interface, simply put a placeholder for 
resolving it is sufficient, which will go away when this code path is removed. 
    
    here is an example
    
    case class Range(child: Expression) extends UnaryExpression with 
AggregateExpression {
    +  override def nullable: Boolean = false
    +  override def dataType: DoubleType.type = DoubleType
    +  override def foldable: Boolean = false
    +  override def toString: String = s"RANGE($child)"
    +}


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