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imay merged 1 commit into from
Jun 6, 2019
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modify udf docs #1260

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12 changes: 9 additions & 3 deletions docs/documentation/cn/extending-doris/user-defined-function.md
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Expand Up @@ -48,13 +48,19 @@
|Varchar|StringVal|
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### 修改CMakeLists.txt
## 编译UDF函数

在`be/src/udf_samples/CMakeLists.txt`增加对应的动态库创建描述，类似于`add_library(udfsample SHARED udf_sample.cpp)`。这个描述增加了一个`udfsample`动态库。后面需要写上涉及的所有源文件（不包含头文件）。
### 编译Doris

在Doris根目录下执行`sh build.sh`就会在`output/udf/`生成对应`headers|libs`

### 编写CMakeLists.txt

基于上一步生成的`headers|libs`，用户可以使用`CMakeLists`等工具引入该依赖；在`CMakeLists`中，可以通过向`CMAKE_CXX_FLAGS`添加`-I|L`分别指定`headers|libs`路径；然后使用`add_library`添加动态库。例如，在`be/src/udf_samples/CMakeLists.txt`中，使用`add_library(udfsample SHARED udf_sample.cpp)`增加了一个`udfsample`动态库。后面需要写上涉及的所有源文件（不包含头文件）。

### 执行编译

在最外部执行`sh build.sh`就可以生成对应的动态库。生成的动态库的位置，位于`be/build/src/udf_samples/`下。比如`udfsample`就会生成一个文件位于`be/build/src/udf_samples/libudfsample.so`。
在该目录下创建一个`build`目录并在`build`下执行`cmake ../`生成`Makefile`，并执行`make`就会生成对应动态库。

## 创建UDF函数

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