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[GitHub] [incubator-doris] francisoliverlee opened a new pull request #4356: [Doc] Add substr function des
francisoliverlee opened a new pull request #4356:
URL: https://github.com/apache/incubator-doris/pull/4356
## Proposed changes
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## Types of changes
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- [] Bugfix (non-breaking change which fixes an issue)
- [] New feature (non-breaking change which adds functionality)
- [] Breaking change (fix or feature that would cause existing functionality to not work as expected)
- [] Documentation Update (if none of the other choices apply)
- [] Code refactor (Modify the code structure, format the code, etc...)
## Checklist
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- [] I have create an issue on (Fix #ISSUE), and have described the bug/feature there in detail
- [] Compiling and unit tests pass locally with my changes
- [] I have added tests that prove my fix is effective or that my feature works
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## Further comments
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[GitHub] [incubator-doris] morningman commented on a change in pull request #4356: [Doc] Add substr function des
Posted by GitBox <gi...@apache.org>.
morningman commented on a change in pull request #4356:
URL: https://github.com/apache/incubator-doris/pull/4356#discussion_r471121342
##########
File path: docs/en/sql-reference/sql-functions/string-functions/substr.md
##########
@@ -0,0 +1,41 @@
+<!--
+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 str, start position, length)`
+
+
+It returns the left part of a string of specified length, length is char length not the byte size.
+
+
+## example
+
+```
+mysql> select substr("Hello doris",5,3);
++-----------------------------+
+| substr('Hello doris', 5, 3) |
++-----------------------------+
+| o d |
++-----------------------------+
+```
+##keyword
Review comment:
```suggestion
## keyword
```
##########
File path: docs/zh-CN/sql-reference/sql-functions/string-functions/substr.md
##########
@@ -0,0 +1,40 @@
+<!--
+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 str, 起始位置start, 截取字符数length)`
+
+
+它返回从start位置开始计算截取length个字符，length是字符长度，不是字节长度
+
+## example
+
+```
+mysql> select substr("Hello doris",5,3);
++-----------------------------+
+| substr('Hello doris', 5, 3) |
++-----------------------------+
+| o d |
++-----------------------------+
+```
+##keyword
Review comment:
```suggestion
## keyword
```
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