Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/22316#discussion_r219368334
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/RelationalGroupedDataset.scala ---
@@ -330,6 +331,15 @@ class RelationalGroupedDataset protected[sql](
* df.groupBy("year").pivot("course").sum("earnings")
* }}}
*
+ * From Spark 3.0.0, values can be literal columns, for instance,
struct. For pivoting by
--- End diff --
3.0.0 => 2.5.0
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