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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