Github user yhuai commented on a diff in the pull request:
https://github.com/apache/spark/pull/7954#discussion_r36440168
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/aggregate/functions.scala
---
@@ -256,12 +256,16 @@ case class Sum(child: Expression) extends
AlgebraicAggregate {
override def dataType: DataType = resultType
// Expected input data type.
+ // TODO: Once we remove the old code path, we can use our analyzer to
cast NullType
--- End diff --
We replace old aggregate functions to new aggregate functions at planning
time. So, we need to have `NullType` at here to make this expression resolved.
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