Github user mgaido91 commented on a diff in the pull request:
https://github.com/apache/spark/pull/21986#discussion_r207808648
--- 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 --
I called it `Unary` as it gets one input and one function. Honestly I can't
think of a better name without becoming very verbose. if you have a better
suggestion I am happy to follow it. I will add the `nullSafeEval`, thanks!
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