Github user hvanhovell commented on a diff in the pull request:
https://github.com/apache/spark/pull/10402#discussion_r48496502
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/windowExpressions.scala
---
@@ -327,9 +327,9 @@ abstract class OffsetWindowFunction
* both the input and the default expression are foldable, the result is
still not foldable due to
* the frame.
*/
- override def foldable: Boolean = input.foldable && (default == null ||
default.foldable)
+ override def foldable: Boolean = false
- override def nullable: Boolean = input.nullable && (default == null ||
default.nullable)
+ override def nullable: Boolean = default == null || default.nullable
--- End diff --
BTW: This is not a problem, all code should be able to a ```null``` default
expression
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