qidaye commented on a change in pull request #7915:
URL: https://github.com/apache/incubator-doris/pull/7915#discussion_r794157060
##########
File path: docs/en/sql-reference/sql-functions/string-functions/substr.md
##########
@@ -0,0 +1,55 @@
+---
+{
+ "title": "substr",
+ "language": "en"
+}
+---
+
+<!--
+Licensed to the Apache Software Foundation (ASF) under one
+or more contributor license agreements. See the NOTICE file
+distributed with this work for additional information
+regarding copyright ownership. The ASF licenses this file
+to you under the Apache License, Version 2.0 (the
+"License"); you may not use this file except in compliance
+with the License. You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing,
+software distributed under the License is distributed on an
+"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+KIND, either express or implied. See the License for the
+specific language governing permissions and limitations
+under the License.
+-->
+
+# substr
+## description
+### Syntax
+
+`VARCHAR substr(VARCHAR content, INT start, INT length)`
+
+Find a substring, return the part of the string described by the first
parameter starting from start and having a length of len. The index of the
first letter is 1.
+
+## example
+
+```
+mysql> select substr("Hello doris",2,1);
Review comment:
```suggestion
mysql> select substr("Hello doris", 2, 1);
```
##########
File path: docs/.vuepress/sidebar/zh-CN.js
##########
@@ -373,6 +373,7 @@ module.exports = [
"starts_with",
"strleft",
"strright",
+ "substr",
Review comment:
```suggestion
"substr",
```
##########
File path: docs/en/sql-reference/sql-functions/string-functions/substr.md
##########
@@ -0,0 +1,55 @@
+---
+{
+ "title": "substr",
+ "language": "en"
+}
+---
+
+<!--
+Licensed to the Apache Software Foundation (ASF) under one
+or more contributor license agreements. See the NOTICE file
+distributed with this work for additional information
+regarding copyright ownership. The ASF licenses this file
+to you under the Apache License, Version 2.0 (the
+"License"); you may not use this file except in compliance
+with the License. You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing,
+software distributed under the License is distributed on an
+"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+KIND, either express or implied. See the License for the
+specific language governing permissions and limitations
+under the License.
+-->
+
+# substr
+## description
+### Syntax
+
+`VARCHAR substr(VARCHAR content, INT start, INT length)`
+
+Find a substring, return the part of the string described by the first
parameter starting from start and having a length of len. The index of the
first letter is 1.
+
+## example
+
+```
+mysql> select substr("Hello doris",2,1);
++-----------------------------+
+| substr('Hello doris', 2, 1) |
++-----------------------------+
+| e |
++-----------------------------+
+
+
+mysql> select substr("Hello doris",1,2);
Review comment:
```suggestion
mysql> select substr("Hello doris", 1, 2);
```
##########
File path: docs/zh-CN/sql-reference/sql-functions/string-functions/substr.md
##########
@@ -0,0 +1,55 @@
+---
+{
+ "title": "substr",
+ "language": "zh-CN"
+}
+---
+
+<!--
+Licensed to the Apache Software Foundation (ASF) under one
+or more contributor license agreements. See the NOTICE file
+distributed with this work for additional information
+regarding copyright ownership. The ASF licenses this file
+to you under the Apache License, Version 2.0 (the
+"License"); you may not use this file except in compliance
+with the License. You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing,
+software distributed under the License is distributed on an
+"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+KIND, either express or implied. See the License for the
+specific language governing permissions and limitations
+under the License.
+-->
+
+# substr
+## description
+### Syntax
+
+`VARCHAR substr(VARCHAR content, INT start, INT length)`
+
+求子字符串，返回第一个参数描述的字符串中从start开始长度为len的部分字符串。首字母的下标为1。
+
+## example
+
+```
+mysql> select substr("Hello doris",2,1);
++-----------------------------+
+| substr('Hello doris', 2, 1) |
++-----------------------------+
+| e |
++-----------------------------+
+
+
+mysql> select substr("Hello doris",1,2);
Review comment:
```suggestion
mysql> select substr("Hello doris", 1, 2);
```
##########
File path: docs/zh-CN/sql-reference/sql-functions/string-functions/substr.md
##########
@@ -0,0 +1,55 @@
+---
+{
+ "title": "substr",
+ "language": "zh-CN"
+}
+---
+
+<!--
+Licensed to the Apache Software Foundation (ASF) under one
+or more contributor license agreements. See the NOTICE file
+distributed with this work for additional information
+regarding copyright ownership. The ASF licenses this file
+to you under the Apache License, Version 2.0 (the
+"License"); you may not use this file except in compliance
+with the License. You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing,
+software distributed under the License is distributed on an
+"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+KIND, either express or implied. See the License for the
+specific language governing permissions and limitations
+under the License.
+-->
+
+# substr
+## description
+### Syntax
+
+`VARCHAR substr(VARCHAR content, INT start, INT length)`
+
+求子字符串，返回第一个参数描述的字符串中从start开始长度为len的部分字符串。首字母的下标为1。
+
+## example
+
+```
+mysql> select substr("Hello doris",2,1);
Review comment:
```suggestion
mysql> select substr("Hello doris", 2, 1);
```
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