Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/21045#discussion_r193977412
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/functions.scala ---
@@ -3508,6 +3508,14 @@ object functions {
*/
def map_entries(e: Column): Column = withExpr { MapEntries(e.expr) }
+ /**
+ * Merge multiple columns into a resulting one.
--- End diff --
I would match the doc in Scala / Python (probably SQL too).
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