Add test cases with row values for COUNT()

h2/src/test/org/h2/test/scripts/functions/aggregate/count.sql

@@ -134,3 +134,23 @@ SELECT COUNT(N) OVER (PARTITION BY N) C FROM TEST;
 
 DROP TABLE TEST;
 > ok
+
+CREATE TABLE TEST(A INT, B INT) AS (VALUES (1, NULL), (1, NULL), (2, NULL));
+> ok
+
+SELECT COUNT((A, B)) C, COUNT(DISTINCT (A, B)) CD FROM TEST;
+> C CD
+> - --
+> 3 2
+> rows: 1
+
+SELECT COUNT(*) OVER (PARTITION BY A, B) C1, COUNT(*) OVER (PARTITION BY (A, B)) C2 FROM TEST;
+> C1 C2
+> -- --
+> 1  1
+> 2  2
+> 2  2
+> rows: 3
+
+DROP TABLE TEST;
+> ok