Github user davies commented on a diff in the pull request:
https://github.com/apache/spark/pull/9819#discussion_r47406652
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/windowExpressions.scala
---
@@ -246,85 +260,244 @@ object SpecifiedWindowFrame {
}
}
+case class UnresolvedWindowExpression(
+ child: Expression,
+ windowSpec: WindowSpecReference) extends UnaryExpression with
Unevaluable {
+
+ override def dataType: DataType = throw new UnresolvedException(this,
"dataType")
+ override def foldable: Boolean = throw new UnresolvedException(this,
"foldable")
+ override def nullable: Boolean = throw new UnresolvedException(this,
"nullable")
+ override lazy val resolved = false
+}
+
+case class WindowExpression(
+ windowFunction: Expression,
--- End diff --
Should `windowFunction` must be a `AggregationExpression`?
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