Github user mn-mikke commented on a diff in the pull request:
https://github.com/apache/spark/pull/22045#discussion_r208747953
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/higherOrderFunctions.scala
---
@@ -442,3 +442,61 @@ case class ArrayAggregate(
override def prettyName: String = "aggregate"
}
+
+/**
+ * Transform Values for every entry of the map by applying
transform_values function.
+ * Returns map wth transformed values
+ */
+@ExpressionDescription(
+usage = "_FUNC_(expr, func) - Transforms values in the map using the
function.",
+examples = """
+ Examples:
+ > SELECT _FUNC_(map(array(1, 2, 3), array(1, 2, 3), (k,v) -> k + 1);
--- End diff --
nit:```(k, v)``` and maybe I would use ```v + 1``` instead of ```k + 1```.
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