Github user ueshin commented on a diff in the pull request: https://github.com/apache/spark/pull/22013#discussion_r208811179 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/higherOrderFunctions.scala --- @@ -442,3 +442,65 @@ case class ArrayAggregate( override def prettyName: String = "aggregate" } + +/** + * Transform Keys for every entry of the map by applying the transform_keys function. + * Returns map with transformed key entries + */ +@ExpressionDescription( + usage = "_FUNC_(expr, func) - Transforms elements in a map using the function.", + examples = """ + Examples: + > SELECT _FUNC_(map(array(1, 2, 3), array(1, 2, 3), (k, v) -> k + 1); + map(array(2, 3, 4), array(1, 2, 3)) + > SELECT _FUNC_(map(array(1, 2, 3), array(1, 2, 3), (k, v) -> k + v); --- End diff -- ditto.
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