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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