add license

src/main/java/com/alibaba/druid/sql/ast/expr/SQLAggregateOption.java

@@ -1,9 +1,17 @@
 /*
- * Copyright 2015 Alibaba.com All right reserved. This software is the
- * confidential and proprietary information of Alibaba.com ("Confidential
- * Information"). You shall not disclose such Confidential Information and shall
- * use it only in accordance with the terms of the license agreement you entered
- * into with Alibaba.com.
+ * Copyright 1999-2011 Alibaba Group Holding Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
  */
 package com.alibaba.druid.sql.ast.expr;