chunjun如何自定义UDF,并使用
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### Search before asking
- [x] I had searched in the [issues](https://github.com/DTStack/chunjun/issues) and found no similar question.
- [x] I had googled my question but i didn't get any help.
- [x] I had read the documentation: [ChunJun doc](https://dtstack.github.io/chunjun) but it didn't help me.
### Description
大佬，chunjun1.12 使用实时计算SQL 需要自定义UDF 并在SQL中使用，想问一下大佬 如何实现
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