cloud-fan commented on code in PR #47105:
URL: https://github.com/apache/spark/pull/47105#discussion_r1666458163
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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/aggregate/linearRegression.scala:
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@@ -271,8 +271,13 @@ case class RegrSlope(left: Expression, right: Expression)
extends DeclarativeAgg
override lazy val initialValues: Seq[Expression] = covarPop.initialValues ++
varPop.initialValues
- override lazy val updateExpressions: Seq[Expression] =
- covarPop.updateExpressions ++ varPop.updateExpressions
+ override lazy val updateExpressions: Seq[Expression] = {
+ val isNull = left.isNull || right.isNull
+ val updateResult = covarPop.updateExpressions ++ varPop.updateExpressions
+ aggBufferAttributes.zip(updateResult).map { case (oldValue, newValue) =>
+ If(isNull, oldValue, newValue)
Review Comment:
we only need to add this for `varPop.updateExpressions`
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