cloud-fan commented on code in PR #43910:
URL: https://github.com/apache/spark/pull/43910#discussion_r1403384646
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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/aggregate/percentiles.scala:
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@@ -350,6 +352,36 @@ case class Median(child: Expression)
newChild: Expression): Median = this.copy(child = newChild)
}
+/**
+ * A factory used to create the inverse distribution function during the
analysis phase.
+ * This factory is also an aggregate function that cannot be evaluated.
+ */
+trait InverseDistributionFactory extends AggregateFunction {
Review Comment:
instead of having a factory, shall we create a fake `PercentileCont` first
and then update its `left` expression later in `validateFunction`?
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