cloud-fan commented on a change in pull request #34894:
URL: https://github.com/apache/spark/pull/34894#discussion_r821683761
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/aggregate/linearRegression.scala
##########
@@ -105,3 +106,34 @@ case class RegrAvgY(left: Expression, right: Expression)
newLeft: Expression, newRight: Expression): RegrAvgY =
this.copy(left = newLeft, right = newRight)
}
+
+// scalastyle:off line.size.limit
+@ExpressionDescription(
+ usage = "_FUNC_(y, x) - Returns the number of non-null number pairs in a
group, where `y` is the dependent variable and `x` is the independent
variable.",
+ examples = """
+ Examples:
+ > SELECT _FUNC_(y, x) FROM VALUES (1, 2), (2, 2), (2, 3), (2, 4) AS
tab(y, x);
+ 0.2727272727272727
+ > SELECT _FUNC_(y, x) FROM VALUES (1, null) AS tab(y, x);
+ NULL
+ > SELECT _FUNC_(y, x) FROM VALUES (null, 1) AS tab(y, x);
+ NULL
+ > SELECT _FUNC_(y, x) FROM VALUES (1, 2), (2, null), (2, 3), (2, 4) AS
tab(y, x);
+ 0.7500000000000001
+ > SELECT _FUNC_(y, x) FROM VALUES (1, 2), (2, null), (null, 3), (2, 4)
AS tab(y, x);
+ 1.0
+ """,
+ group = "agg_funcs",
+ since = "3.3.0")
+// scalastyle:on line.size.limit
+case class RegrR2(x: Expression, y: Expression) extends PearsonCorrelation(x,
y, true) {
+ override def prettyName: String = "regr_r2"
+ override val evaluateExpression: Expression = {
+ lazy val corr = ck / sqrt(xMk * yMk)
+ If(n === 0.0, Literal.create(null, DoubleType),
+ If(n === 1.0, divideByZeroEvalResult, corr * corr))
Review comment:
`divideByZeroEvalResult` is for legacy behaviors, which we don't need to
follow in new functions.
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