Added a test #5614

dbms/tests/queries/0_stateless/00963_achimbab.reference

@@ -0,0 +1,57 @@
+{
+	"meta":
+	[
+		{
+			"name": "total",
+			"type": "Nullable(UInt8)"
+		},
+		{
+			"name": "arrayElement(k, 1)",
+			"type": "Nullable(UInt16)"
+		},
+		{
+			"name": "arrayElement(k, 2)",
+			"type": "Nullable(UInt16)"
+		}
+	],
+
+	"data":
+	[
+		{
+			"total": 1,
+			"arrayElement(k, 1)": null,
+			"arrayElement(k, 2)": 4
+		},
+		{
+			"total": 1,
+			"arrayElement(k, 1)": null,
+			"arrayElement(k, 2)": 2
+		},
+		{
+			"total": 1,
+			"arrayElement(k, 1)": null,
+			"arrayElement(k, 2)": 1
+		},
+		{
+			"total": 1,
+			"arrayElement(k, 1)": null,
+			"arrayElement(k, 2)": 3
+		},
+		{
+			"total": 1,
+			"arrayElement(k, 1)": null,
+			"arrayElement(k, 2)": 5
+		}
+	],
+
+	"totals":
+	{
+		"total": 1,
+		"arrayElement(k, 1)": null,
+		"arrayElement(k, 2)": null
+	},
+
+	"rows": 5,
+
+	"rows_before_limit_at_least": 5
+}

dbms/tests/queries/0_stateless/00963_achimbab.sql

@@ -0,0 +1,18 @@
+SET output_format_write_statistics = 0;
+
+select 
+    sum(cnt) > 0 as total,
+    k[1], k[2]
+    from
+    (
+        select
+            arrayMap( x ->  x % 3 ? toNullable(number%5 + x) : null, range(3)) as k,
+            number % 4 ? toNullable( rand() ) : Null  as cnt
+        from system.numbers_mt
+        where number < 1000000
+        limit 1000000
+    ) 
+group by k with totals 
+order by total desc 
+SETTINGS max_threads = 100, max_execution_time = 120 
+format JSON;