Github user xinyunh commented on a diff in the pull request: https://github.com/apache/spark/pull/2099#discussion_r16923701 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/aggregates.scala --- @@ -409,3 +424,15 @@ case class FirstFunction(expr: Expression, base: AggregateExpression) extends Ag override def eval(input: Row): Any = result } + +case class LastFunction(expr: Expression, base: AggregateExpression) extends AggregateFunction { + def this() = this(null, null) // Required for serialization. + + var result: Any = null + + override def update(input: Row): Unit = { + result = input + } + + override def eval(input: Row): Any = if (result != null) expr.eval(result.asInstanceOf[Row]) else null +} --- End diff -- Ok. BTW, need I create a new pull request? Or just updating this branch?
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