Add test.

tests/queries/0_stateless/01134_max_rows_to_group_by.reference

@@ -0,0 +1,33 @@
+test2	0
+test2	1
+test2	2
+test2	3
+test2	4
+test2	5
+test2	6
+test2	7
+test2	8
+test2	9
+test2	10
+test3	0
+test3	1
+test3	2
+test3	3
+test3	4
+test3	5
+test3	6
+test3	7
+test3	8
+test3	9
+test3	10
+test5	0
+test5	1
+test5	2
+test5	3
+test5	4
+test5	5
+test5	6
+test5	7
+test5	8
+test5	9
+test5	10

tests/queries/0_stateless/01134_max_rows_to_group_by.sql

@@ -0,0 +1,17 @@
+SET max_block_size = 1;
+SET max_rows_to_group_by = 10;
+SET group_by_overflow_mode = 'throw';
+
+SELECT 'test1', number FROM system.numbers GROUP BY number; -- { serverError 158 }
+
+SET group_by_overflow_mode = 'break';
+SELECT 'test2', number FROM system.numbers GROUP BY number ORDER BY number;
+
+SET max_rows_to_read = 500;
+SELECT 'test3', number FROM system.numbers GROUP BY number ORDER BY number;
+
+SET group_by_overflow_mode = 'any';
+SELECT 'test4', number FROM numbers(1000) GROUP BY number ORDER BY number; -- { serverError 158 }
+
+SET max_rows_to_read = 1000;
+SELECT 'test5', number FROM numbers(1000) GROUP BY number ORDER BY number;