Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/6343#discussion_r30870814
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/functions.scala ---
@@ -321,6 +322,214 @@ object functions {
def max(columnName: String): Column = max(Column(columnName))
//////////////////////////////////////////////////////////////////////////////////////////////
+ // Window functions
+
//////////////////////////////////////////////////////////////////////////////////////////////
+
+ /**
+ * Window function: returns the lag value of current row of the
expression,
+ * null when the current row extends before the beginning of the window.
+ *
+ * @group window_funcs
--- End diff --
added for all of them
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