Github user aray commented on a diff in the pull request:
https://github.com/apache/spark/pull/10677#discussion_r50137528
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/functions.scala ---
@@ -324,6 +324,51 @@ object functions extends LegacyFunctions {
*/
def first(columnName: String): Column = first(Column(columnName))
+
+ /**
+ * Aggregate function: indicates whether a specified column in a GROUP
BY list is aggregated
+ * or not, returns 1 for aggregated or 0 for not aggregated in the
result set.
+ *
+ * @group agg_funcs
+ * @since 2.0.0
+ */
+ def grouping(e: Column): Column = Column(Grouping(e.expr))
+
+ /**
+ * Aggregate function: indicates whether a specified column in a GROUP
BY list is aggregated
+ * or not, returns 1 for aggregated or 0 for not aggregated in the
result set.
+ *
+ * @group agg_funcs
+ * @since 2.0.0
+ */
+ def grouping(columnName: String): Column = grouping(Column(columnName))
+
+ /**
+ * Aggregate function: returns the level of grouping, equals to
+ *
+ * (grouping(c1) << (n-1)) + (grouping(c1) << (n-2)) + ... +
grouping(cn)
--- End diff --
Second term should be grouping(c**2**)
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