Github user mengxr commented on a diff in the pull request:
https://github.com/apache/spark/pull/5802#discussion_r29410114
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/functions.scala ---
@@ -363,6 +380,28 @@ object functions {
def sqrt(e: Column): Column = Sqrt(e.expr)
/**
+ * Creates a new struct column. The input column must be a column in a
[[DataFrame]], or
+ * a derived column expression that is named (i.e. aliased).
+ *
+ * @group normal_funcs
+ */
+ @scala.annotation.varargs
+ def struct(cols: Column*): Column = {
--- End diff --
Do we allow empty input `struct()`?
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