Github user ueshin commented on a diff in the pull request: https://github.com/apache/spark/pull/21986#discussion_r207702606 --- 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 like this trait but I'm not sure whether we can say `"Unary"HigherOrderFunction` for this.
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