Github user mn-mikke commented on a diff in the pull request: https://github.com/apache/spark/pull/22013#discussion_r208161643 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/higherOrderFunctions.scala --- @@ -365,3 +365,69 @@ case class ArrayAggregate( override def prettyName: String = "aggregate" } + +/** + * Transform Keys in a map using the transform_keys function. --- End diff -- maybe a better comment?
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