Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/22316#discussion_r214544896
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/RelationalGroupedDataset.scala ---
@@ -406,6 +407,15 @@ class RelationalGroupedDataset protected[sql](
* df.groupBy($"year").pivot($"course", Seq("dotNET",
"Java")).sum($"earnings")
* }}}
*
+ * For pivoting by multiple columns, use the `struct` function to
combine the columns and values:
+ *
+ * {{{
+ * df
+ * .groupBy($"year")
--- End diff --
I would make this line up
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