批量插入导致查询出错

环境：
- jdk1.8
- seata 1.2.0
- mybatis-plus 3.3.2
- shardingsphere 4.1.0

在子事务里面就一条批量插入的语句

```
if (goods != null && !goods.isEmpty()) {
List list = BeanUtil.copyList(goods, XXX.class);
this.saveBatch(list);
//goodsLiveList.forEach(this::save);
}
```

真实执行sql如下：
```
INSERT INTO xxx ( xx,xx,xx ) VALUES ( ?,?,? )
```

发现seata是提交事务后，获取后快照，在InsertExecutor拿不到id，debug发现，seata是通过GeneratedKeysResultSet（shardingsphere)拿到返回结果，但是shardingsphere中的AbstractUnsupportedOperationResultSet是不支持beforeFirst执行的，直接抛出 **SQLFeatureNotSupportedException("beforeFirst")** 异常。导致最后拿不到id，再获取快照时执行的语句如下：

```
select * from xxx where id in ( )
```
这样就出现错误了！

Start with Seata's InsertExecutor and the GeneratedKeysResultSet path described in the report, then inspect ShardingSphere's AbstractUnsupportedOperationResultSet behavior around beforeFirst. Reproduce the saveBatch case with the listed Seata, MyBatis-Plus, and ShardingSphere versions. Done means the batch insert completes without the beforeFirst failure and snapshot lookup receives the inserted IDs.

Written by the indexing model from the issue text.