Github user yhuai commented on a diff in the pull request: https://github.com/apache/spark/pull/9556#discussion_r44464823 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/aggregate/CentralMomentAgg.scala --- @@ -55,13 +57,10 @@ abstract class CentralMomentAgg(child: Expression) extends ImperativeAggregate w override def dataType: DataType = DoubleType - // Expected input data type. - // TODO: Right now, we replace old aggregate functions (based on AggregateExpression1) to the - // new version at planning time (after analysis phase). For now, NullType is added at here - // to make it resolved when we have cases like `select avg(null)`. - // We can use our analyzer to cast NullType to the default data type of the NumericType once - // we remove the old aggregate functions. Then, we will not need NullType at here. - override def inputTypes: Seq[AbstractDataType] = Seq(TypeCollection(NumericType, NullType)) + override def inputTypes: Seq[AbstractDataType] = Seq(TypeCollection(NumericType)) --- End diff -- Done
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