cloud-fan commented on a change in pull request #26420: [SPARK-27986][SQL]
Support ANSI SQL filter predicate for aggregate expression.
URL: https://github.com/apache/spark/pull/26420#discussion_r347947991
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/unresolved.scala
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@@ -244,7 +244,8 @@ case class UnresolvedGenerator(name: FunctionIdentifier,
children: Seq[Expressio
case class UnresolvedFunction(
name: FunctionIdentifier,
children: Seq[Expression],
- isDistinct: Boolean)
+ isDistinct: Boolean,
+ filter: Option[Expression] = None)
Review comment:
shall we treat `filter` as child as well? e.g.
```
case class UnresolvedFunction(... inputs: Seq[Expression], ... filter:
Option[Expression] = None) {
def children = inputs ++ filter
}
```
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