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Update 09-udf.md

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docs/en/07-develop/09-udf.md
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@ -220,7 +220,7 @@ After compiling your function into a DLL, you add it to TDengine. For more infor
### Sample scalar function: [bit_and](https://github.com/taosdata/TDengine/blob/3.0/tests/script/sh/bit_and.c)
The bit_add function implements bitwise addition for multiple columns. If there is only one column, the column is returned. The bit_add function ignores null values.
The bit_and function implements bitwise addition for multiple columns. If there is only one column, the column is returned. The bit_and function ignores null values.
<details>
<summary>bit_and.c</summary>