test: handle licensed SQL fixtures in type DDL corpus

Author: minleejae

src/main/java/net/sf/jsqlparser/statement/RoutineReference.java

@@ -53,7 +53,7 @@ public void setOrderByArguments(List<Argument> orderByArguments) {
     }
 
     /** A signature argument is a data type, not an invocation expression. */
-    public static class Argument implements java.io.Serializable {
+    public static class Argument implements Serializable {
         public enum Mode {
             IN, OUT, INOUT, VARIADIC
         }

src/test/java/net/sf/jsqlparser/statement/create/PostgreSqlTypeDdlTest.java

@@ -56,7 +56,9 @@ static Stream<String> statements() throws Exception {
         try (BufferedReader reader = new BufferedReader(new InputStreamReader(
                 PostgreSqlTypeDdlTest.class.getResourceAsStream("/postgresql/type-ddl.sql"),
                 StandardCharsets.UTF_8))) {
-            return reader.lines().filter(line -> !line.isEmpty()).collect(Collectors.toList())
+            return reader.lines()
+                    .filter(line -> !line.trim().isEmpty() && !line.trim().startsWith("--"))
+                    .collect(Collectors.toList())
                     .stream();
         }
     }

src/test/resources/postgresql/type-ddl.sql

@@ -1,3 +1,12 @@
+---
+-- #%L
+-- JSQLParser library
+-- %%
+-- Copyright (C) 2004 - 2026 JSQLParser
+-- %%
+-- Dual licensed under GNU LGPL 2.1 or Apache License 2.0
+-- #L%
+---
 CREATE TYPE mood AS ENUM ('sad', 'ok', 'happy')
 CREATE TYPE app."Mood" AS ENUM ('can''t', 'OK')
 CREATE TYPE empty_enum AS ENUM ()