Github user hvanhovell commented on a diff in the pull request: https://github.com/apache/spark/pull/21986#discussion_r207954320 --- 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 -- We use the term `Unary` a lot and this is different from the other uses. The name should convey a HigherOrderFunction that only uses a single (lambda) function right? The only thing I can come up with is `SingleHigherOrderFunction`. `Simple` would probably also be fine.
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