User defined functions can be created with source code.

h2/src/test/org/h2/test/db/TestFunctions.java

@@ -48,6 +48,7 @@ public class TestFunctions extends TestBase implements AggregateFunction {
 
     public void test() throws Exception {
         deleteDb("functions");
+        testSource();
         testDynamicArgumentAndReturn();
         testUUID();
         testDeterministic();
@@ -60,6 +61,18 @@ public class TestFunctions extends TestBase implements AggregateFunction {
         deleteDb("functions");
     }
 
+    private void testSource() throws SQLException {
+        Connection conn = getConnection("functions");
+        Statement stat = conn.createStatement();
+        ResultSet rs;
+        stat.execute("create force alias sayHi as 'String test(String name) { return \"Hello \" + name; }'");
+        rs = stat.executeQuery("call sayHi('Joe')");
+        rs.next();
+        assertEquals("Hello Joe", rs.getString(1));
+        stat.execute("drop alias sayHi");
+        conn.close();
+    }
+
     private void testDynamicArgumentAndReturn() throws SQLException {
         Connection conn = getConnection("functions");
         Statement stat = conn.createStatement();