Github user yhuai commented on a diff in the pull request:
https://github.com/apache/spark/pull/9003#discussion_r43162207
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/aggregates.scala
---
@@ -991,3 +991,73 @@ case class StddevFunction(
}
}
}
+
+// placeholder
+case class Kurtosis(child: Expression) extends UnaryExpression with
AggregateExpression {
+
+ override def nullable: Boolean = false
+
+ override def dataType: DoubleType.type = DoubleType
+
+ override def foldable: Boolean = false
+
+ override def prettyName: String = "kurtosis"
+
+ override def toString: String = s"KURTOSIS($child)"
+}
+
+// placeholder
+case class Skewness(child: Expression) extends UnaryExpression with
AggregateExpression {
+
+ override def nullable: Boolean = false
+
+ override def dataType: DoubleType.type = DoubleType
+
+ override def foldable: Boolean = false
+
+ override def prettyName: String = "skewness"
+
+ override def toString: String = s"SKEWNESS($child)"
+}
+
+// placeholder
+case class Variance(child: Expression) extends UnaryExpression with
AggregateExpression {
+
+ override def nullable: Boolean = false
+
+ override def dataType: DoubleType.type = DoubleType
+
+ override def foldable: Boolean = false
+
+ override def prettyName: String = "variance"
+
+ override def toString: String = s"VARIANCE($child)"
+}
+
+// placeholder
+case class VariancePop(child: Expression) extends UnaryExpression with
AggregateExpression {
+
+ override def nullable: Boolean = false
+
+ override def dataType: DoubleType.type = DoubleType
+
+ override def foldable: Boolean = false
+
+ override def prettyName: String = "variance_pop"
+
+ override def toString: String = s"VAR_POP($child)"
+}
+
+// placeholder
+case class VarianceSamp(child: Expression) extends UnaryExpression with
AggregateExpression {
+
+ override def nullable: Boolean = false
+
+ override def dataType: DoubleType.type = DoubleType
+
+ override def foldable: Boolean = false
+
+ override def prettyName: String = "variance_samp"
+
+ override def toString: String = s"VAR_SAMP($child)"
+}
--- End diff --
What will be the error message if we call this function when
`spark.sql.useAggregate2=false`? It will be good to provide a meaning error
message.
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