Github user mn-mikke commented on a diff in the pull request:
https://github.com/apache/spark/pull/22243#discussion_r213022884
--- 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 --
If we moved the definition of ```nullable``` straight to
```HigherOrderFunction``` as ```arguments.exists(_.nullable)```, we could also
avoid the duplicities in ```ZipWith``` and ```MapZipWith```. WDYT?
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