change as requested

docs/en/sql-reference/functions/string-functions.md

@@ -695,7 +695,7 @@ endsWith(str, suffix)
 
 ## endsWithUTF8
 
-Returns whether string `str` ends with `suffix`, assuming that both strings contain valid UTF-8 encoded text. If this assumption is violated, no exception is thrown and the result is undefined.
+Returns whether string `str` ends with `suffix`, the difference between `endsWithUTF8` and `endsWith` is that `endsWithUTF8` match `str` and `suffix` by UTF-8 characters.
 
 **Syntax**
 
@@ -727,7 +727,7 @@ SELECT startsWith('Spider-Man', 'Spi');
 
 ## startsWithUTF8
 
-Returns whether string `str` starts with `prefix`, assuming that both string contains valid UTF-8 encoded text. If this assumption is violated, no exception is thrown and the result is undefined.
+Returns whether string `str` starts with `prefix`, the difference between `startsWithUTF8` and `startsWith` is that `startsWithUTF8` match `str` and `suffix` by UTF-8 characters.
 
 
 **Example**

src/Functions/endsWithUTF8.cpp

@@ -10,7 +10,12 @@ using FunctionEndsWithUTF8 = FunctionStartsEndsWith<NameEndsWithUTF8>;
 
 REGISTER_FUNCTION(EndsWithUTF8)
 {
-    factory.registerFunction<FunctionEndsWithUTF8>();
+    factory.registerFunction<FunctionEndsWithUTF8>(FunctionDocumentation{
+        .description = R"(
+Returns whether string `str` ends with `suffix`, the difference between `endsWithUTF8` and `endsWith` is that `endsWithUTF8` match `str` and `suffix` by UTF-8 characters.
+        )",
+        .examples{{"endsWithUTF8", "select endsWithUTF8('富强民主文明和谐', '富强');", ""}},
+        .categories{"String"}});
 }
 
 }

src/Functions/startsWithUTF8.cpp

@@ -10,7 +10,12 @@ using FunctionStartsWithUTF8 = FunctionStartsEndsWith<NameStartsWithUTF8>;
 
 REGISTER_FUNCTION(StartsWithUTF8)
 {
-    factory.registerFunction<FunctionStartsWithUTF8>();
+    factory.registerFunction<FunctionStartsWithUTF8>(FunctionDocumentation{
+        .description = R"(
+Returns whether string `str` starts with `prefix`, the difference between `startsWithUTF8` and `startsWith` is that `startsWithUTF8` match `str` and `suffix` by UTF-8 characters.
+        )",
+        .examples{{"startsWithUTF8", "select startsWithUTF8('富强民主文明和谐', '富强');", ""}},
+        .categories{"String"}});
 }
 
 }

tests/queries/0_stateless/02415_all_new_functions_must_be_documented.reference

@@ -263,7 +263,6 @@ encodeURLComponent
 encodeURLFormComponent
 encodeXMLComponent
 endsWith
-endsWithUTF8
 equals
 erf
 erfc
@@ -666,7 +665,6 @@ splitByString
 splitByWhitespace
 sqrt
 startsWith
-startsWithUTF8
 subBitmap
 substring
 substringUTF8