Add some tests

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

@@ -83,3 +83,14 @@ SELECT I, V, COUNT(V) OVER W C, COUNT(DISTINCT V) OVER W D FROM
 > 6 2 6 2
 > 7 3 7 3
 > rows (ordered): 7
+
+SELECT I, C, COUNT(I) OVER (PARTITION BY C) CNT FROM
+    VALUES (1, 1), (2, 1), (3, 2), (4, 2), (5, 2) T(I, C);
+> I C CNT
+> - - ---
+> 1 1 2
+> 2 1 2
+> 3 2 3
+> 4 2 3
+> 5 2 3
+> rows: 5

h2/src/test/org/h2/test/scripts/functions/window/lead.sql

@@ -143,3 +143,11 @@ SELECT LAG(VALUE) OVER (ORDER BY ID RANGE CURRENT ROW) FROM TEST;
 
 DROP TABLE TEST;
 > ok
+
+SELECT C, SUM(I) S, LEAD(SUM(I)) OVER (ORDER /**/ BY SUM(I)) L FROM
+    VALUES (1, 1), (2, 1), (4, 2), (8, 2) T(I, C) GROUP BY C;
+> C S  L
+> - -- ----
+> 1 3  12
+> 2 12 null
+> rows: 2