Github user jiangxb1987 commented on a diff in the pull request:
https://github.com/apache/spark/pull/16873#discussion_r100348823
--- Diff: sql/core/src/test/resources/sql-tests/inputs/grouping_set.sql ---
@@ -13,5 +18,8 @@ SELECT a, b, c, count(d) FROM grouping GROUP BY a, b, c
GROUPING SETS ((a));
-- SPARK-17849: grouping set throws NPE #3
SELECT a, b, c, count(d) FROM grouping GROUP BY a, b, c GROUPING SETS
((c));
+-- SPARK-19509: grouping set should honor input nullability
+SELECT COUNT(1) FROM grouping_null GROUP BY e GROUPING SETS (e);
-
+DROP VIEW IF EXISTS grouping;
+DROP VIEW IF EXISTS grouping_null;
--- End diff --
Nit: Should we leave an extra empty line for this file?
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