Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/22243#discussion_r213178417
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/higherOrderFunctions.scala
---
@@ -155,6 +155,8 @@ trait HigherOrderFunction extends Expression with
ExpectsInputTypes {
*/
trait SimpleHigherOrderFunction extends HigherOrderFunction {
+ override def nullable: Boolean = argument.nullable
--- End diff --
Yea, let's go ahead then if the change is small, straightforward and more
deduplciation
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