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Update 09-udf.md

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@ -116,7 +116,7 @@ aggfn为函数名的占位符，需要修改为自己的函数名，如l2norm。
参数的具体含义是：
- inputDataBlock: 输入的数据块
- resultColumn: 输出列。输出列
- resultColumn: 输出列
### 聚合接口函数