morningman commented on a change in pull request #4347:
URL: https://github.com/apache/incubator-doris/pull/4347#discussion_r470004948
##########
File path:
docs/zh-CN/sql-reference/sql-functions/string-functions/str_replace.md
##########
@@ -0,0 +1,46 @@
+---
+{
+ "title": "str_replace",
Review comment:
In MySQL, this function named `replace()`, so better to name it as
`replace()`
##########
File path: docs/en/sql-reference/sql-functions/string-functions/str_replace.md
##########
@@ -0,0 +1,46 @@
+---
+{
+ "title": "str_replace",
+ "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.
+-->
+
+# str_replace
+## description
+### Syntax
+
+`VARCHAR STR_REPLACE (VARCHAR str, VARCHAR old, VARCHAR new)`
+
+replace all old substring with new substring in str
+
+## example
+
+```
+mysql> select str_replace("http://www.baidu.com:9090";, "9090", "");
++------------------------------------------------------+
+| str_replace('http://www.baidu.com:9090', '9090', '') |
++------------------------------------------------------+
+| http://www.baidu.com: |
++------------------------------------------------------+
+```
+##keyword
Review comment:
```suggestion
## keyword
```
##########
File path: be/src/exprs/string_functions.cpp
##########
@@ -998,4 +998,23 @@ StringVal StringFunctions::split_part(FunctionContext*
context, const StringVal&
int len = (find[field.val - 1] == -1 ? content.len : find[field.val - 1])
- start_pos;
return StringVal(content.ptr + start_pos, len);
}
+
+StringVal StringFunctions::str_replace(FunctionContext *context, const
StringVal &origStr, const StringVal &oldStr, const StringVal &newStr) {
+ if (origStr.is_null || oldStr.is_null || newStr.is_null) {
+ return origStr;
Review comment:
Should return null if any of them is null
##########
File path: be/test/exprs/string_functions_test.cpp
##########
@@ -494,6 +494,19 @@ TEST_F(StringFunctionsTest, rpad) {
ASSERT_EQ(StringVal("呵呵hih"),
StringFunctions::rpad(ctx, StringVal("呵呵"), IntVal(5),
StringVal("hi")));
}
+
+TEST_F(StringFunctionsTest, str_replace) {
+ ASSERT_EQ(StringVal("http://www.baidu.com:8080";),
+ StringFunctions::str_replace(ctx,
StringVal("http://www.baidu.com:9090";), StringVal("9090"), StringVal("8080")));
+
+ ASSERT_EQ(StringVal("http://www.baidu.com:9090";),
+ StringFunctions::str_replace(ctx,
StringVal("http://www.baidu.com:9090";), StringVal("9070"), StringVal("8080")));
+ ASSERT_EQ(StringVal("http://www.baidu.com:9090";),
+ StringFunctions::str_replace(ctx,
StringVal("http://www.baidu.com:9090";), StringVal(""), StringVal("8080")));
+ ASSERT_EQ(StringVal("http://www.baidu.com:";),
+ StringFunctions::str_replace(ctx,
StringVal("http://www.baidu.com:9090";), StringVal("9090"), StringVal("")));
Review comment:
Better to add more tests to test to corner case, like `null`, `empty
string`, `expr2 longer than expr1`, Chinese char, etc...
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