Github user yhuai commented on a diff in the pull request:
https://github.com/apache/spark/pull/9422#discussion_r43727618
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/aggregate/functions.scala
---
@@ -371,101 +371,77 @@ abstract class StddevAgg(child: Expression) extends
DeclarativeAggregate {
private val resultType = DoubleType
- private val preCount = AttributeReference("preCount", resultType)()
- private val currentCount = AttributeReference("currentCount",
resultType)()
- private val preAvg = AttributeReference("preAvg", resultType)()
- private val currentAvg = AttributeReference("currentAvg", resultType)()
- private val currentMk = AttributeReference("currentMk", resultType)()
+ private val count = AttributeReference("count", resultType)()
+ private val avg = AttributeReference("avg", resultType)()
+ private val mk = AttributeReference("mk", resultType)()
--- End diff --
@JihongMA Can you take a look at `Stddev`'s change? We are changing the way
that we evaluate expressions in mutable projection. We will first evaluate all
expressions and then update the mutable row.
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