Github user mengxr commented on a diff in the pull request:
https://github.com/apache/spark/pull/10960#discussion_r51533698
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/aggregate/CentralMomentAgg.scala
---
@@ -57,173 +55,170 @@ abstract class CentralMomentAgg(child: Expression)
extends ImperativeAggregate w
override def dataType: DataType = DoubleType
- override def inputTypes: Seq[AbstractDataType] = Seq(NumericType)
+ override def inputTypes: Seq[AbstractDataType] = Seq(DoubleType)
+
+ protected val count = AttributeReference("count", DoubleType, nullable =
false)()
+ protected val avg = AttributeReference("avg", DoubleType, nullable =
false)()
+ protected val m2 = AttributeReference("m2", DoubleType, nullable =
false)()
+ protected val m3 = AttributeReference("m3", DoubleType, nullable =
false)()
+ protected val m4 = AttributeReference("m4", DoubleType, nullable =
false)()
+
+ override val aggBufferAttributes = Seq(count, avg, m2, m3,
m4).take(momentOrder + 1)
--- End diff --
Shall we make `.take(momentOrder + 1)` a private method
(`trimHigherOrder`?) and have it documented?
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