Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/13967#discussion_r69140101
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/functions.scala ---
@@ -2753,6 +2753,22 @@ object functions {
def size(e: Column): Column = withExpr { Size(e.expr) }
/**
+ * Returns the key array of the map.
+ *
+ * @group collection_funcs
+ * @since 2.1.0
+ */
+ def map_keys(e: Column): Column = withExpr { MapKeys(e.expr) }
--- End diff --
Let's not register these functions here for now, we will think about it
later.
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