Github user mn-mikke commented on a diff in the pull request:
https://github.com/apache/spark/pull/21258#discussion_r186410991
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/functions.scala ---
@@ -1033,6 +1033,17 @@ object functions {
@scala.annotation.varargs
def map(cols: Column*): Column = withExpr { CreateMap(cols.map(_.expr)) }
+ /**
+ * Creates a new map column. The array in the first column is used for
keys. The array in the
+ * second column is used for values. All elements in the array for key
should not be null.
--- End diff --
and duplicated
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