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doc: fix syntax error in udf.md

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gccgdb1234 2022-08-22 09:35:49 +08:00
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docs/en/07-develop/09-udf.md
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@ -15,7 +15,7 @@ When you create a user-defined function, you must implement standard interface f
- For aggregate functions, implement the `aggfn_start`, `aggfn`, and `aggfn_finish` interface functions.
- To initialize your function, implement the `udf_init` function. To terminate your function, implement the `udf_destroy` function.
There are strict naming conventions for these interface functions. The names of the start, finish, init, and destroy interfaces must be <udf-name>_start, <udf-name>_finish, <udf-name>_init, and <udf-name>_destroy, respectively. Replace `scalarfn`, `aggfn`, and `udf` with the name of your user-defined function.
There are strict naming conventions for these interface functions. The names of the start, finish, init, and destroy interfaces must be <udf-name\>_start, <udf-name\>_finish, <udf-name\>_init, and <udf-name\>_destroy, respectively. Replace `scalarfn`, `aggfn`, and `udf` with the name of your user-defined function.
## Implementing a Scalar Function
The implementation of a scalar function is described as follows: