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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