从补丁 198 开始，Amazon Redshift 将不再支持创建新的 Python UDF。现有的 Python UDF 将继续正常运行至 2026 年 6 月 30 日。有关更多信息，请参阅[博客文章](https://aws.amazon.com/blogs/big-data/amazon-redshift-python-user-defined-functions-will-reach-end-of-support-after-june-30-2026/)。

# 重新加载卸载的数据
<a name="t_Reloading_unload_files"></a>

要重新加载卸载操作的结果，您可以使用 COPY 命令。

下面的示例演示了一种简单的情况：使用清单文件卸载 VENUE 表、截断，然后重新加载。

```
unload  ('select * from venue order by venueid')
to 's3://amzn-s3-demo-bucket/tickit/venue/reload_' 
iam_role 'arn:aws:iam::0123456789012:role/MyRedshiftRole' 
manifest 
delimiter '|';

truncate venue;

copy venue 
from 's3://amzn-s3-demo-bucket/tickit/venue/reload_manifest' 
iam_role 'arn:aws:iam::0123456789012:role/MyRedshiftRole'
manifest 
delimiter '|';
```

重新加载后，VENUE 表如下所示：

```
select * from venue order by venueid limit 5;

 venueid |         venuename         |  venuecity  | venuestate | venueseats
---------+---------------------------+-------------+------------+-----------
       1 | Toyota Park               | Bridgeview  | IL         |          0
       2 | Columbus Crew Stadium     | Columbus    | OH         |          0
       3 | RFK Stadium               | Washington  | DC         |          0
       4 | CommunityAmerica Ballpark | Kansas City | KS         |          0
       5 | Gillette Stadium          | Foxborough  | MA         |      68756
(5 rows)
```