Github user mn-mikke commented on a diff in the pull request:
https://github.com/apache/spark/pull/22013#discussion_r208160707
--- 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.
+ */
+@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);
--- End diff --
nit: missing space -> ```k, v```
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