CREATE TEMPORARY VIEW grouping AS SELECT * FROM VALUES
  ("1", "2", "3", 1),
  ("4", "5", "6", 1),
  ("7", "8", "9", 1)
  as grouping(a, b, c, d);

-- SPARK-17849: grouping set throws NPE #1
SELECT a, b, c, count(d) FROM grouping GROUP BY a, b, c GROUPING SETS (());

-- SPARK-17849: grouping set throws NPE #2
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));