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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