Github user ueshin commented on a diff in the pull request:
https://github.com/apache/spark/pull/21986#discussion_r207702649
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/higherOrderFunctions.scala
---
@@ -123,7 +125,10 @@ trait HigherOrderFunction extends Expression {
}
}
-trait ArrayBasedHigherOrderFunction extends HigherOrderFunction with
ExpectsInputTypes {
+/**
+ * Trait for functions having as input one argument and one function.
+ */
+trait UnaryHigherOrderFunction extends HigherOrderFunction with
ExpectsInputTypes {
--- End diff --
Btw, how about defining `nullSafeEval` for `input` in this trait like
`UnaryExpression`? (`nullInputSafeEval`?)
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