cloud-fan commented on code in PR #43813:
URL: https://github.com/apache/spark/pull/43813#discussion_r1398685261
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sql/core/src/main/scala/org/apache/spark/sql/Dataset.scala:
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@@ -1825,6 +1825,33 @@ class Dataset[T] private[sql](
RelationalGroupedDataset(toDF(), cols.map(_.expr),
RelationalGroupedDataset.CubeType)
}
+ /**
+ * Create multi-dimensional aggregation for the current Dataset using the
specified grouping sets,
+ * so we can run aggregation on them.
+ * See [[RelationalGroupedDataset]] for all the available aggregate
functions.
+ *
+ * {{{
+ * // Compute the average for all numeric columns group by specific
grouping sets.
+ * ds.groupingSets(Seq(Seq($"department", $"group"),Seq()),$"department",
$"group").avg()
Review Comment:
The SQL syntax is `GROUP BY ... GROUPING SETS (...)`, shall we put grouping
cols as the first parameter?
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