Disable window functions in group queries for now

h2/src/main/org/h2/command/dml/Select.java

@@ -953,6 +953,10 @@ public class Select extends Query {
             throw DbException.get(ErrorCode.WITH_TIES_WITHOUT_ORDER_BY);
         }
 
+        if (isWindowQuery && isGroupQuery) {
+            throw DbException.getUnsupportedException("Window functions in group query are not currently supported.");
+        }
+
         Database db = session.getDatabase();
 
         // first the select list (visible columns),

h2/src/test/org/h2/test/scripts/functions/aggregate/array-agg.sql

@@ -107,5 +107,11 @@ SELECT ARRAY_AGG(ID) OVER (PARTITION BY NAME), NAME FROM TEST;
 > (4, 5, 6)                              c
 > rows: 6
 
+SELECT ARRAY_AGG(SUM(ID)) OVER () FROM TEST;
+> exception FEATURE_NOT_SUPPORTED_1
+
+SELECT ARRAY_AGG(ID) OVER() FROM TEST GROUP BY ID;
+> exception FEATURE_NOT_SUPPORTED_1
+
 DROP TABLE TEST;
 > ok