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new 828102a2a20 [fix](doc) v2.1: fix APPEND_TRAILING_CHAR_IF_ABSENT
examples (EN+ZH) (#3858)
828102a2a20 is described below
commit 828102a2a20fe3459e8cdcfff6f76962b67e6966
Author: boluor <[email protected]>
AuthorDate: Fri May 29 20:00:22 2026 -0700
[fix](doc) v2.1: fix APPEND_TRAILING_CHAR_IF_ABSENT examples (EN+ZH) (#3858)
Backport of #3855 to `version-2.1`.
## Problem
On v2.1 **both** the EN and ZH pages keep the old combined example whose
third call, `APPEND_TRAILING_CHAR_IF_ABSENT('ac', 'cd')`, is documented
as returning `accd`. That is wrong: `<trailing_char>` is a **single**
trailing character, and passing a 2-character string returns `NULL`.
(On v3.x only ZH needed this — EN had already been rewritten. On v2.1
neither language was rewritten, so this PR fixes both.)
## Fix
Replace the combined example with five focused single-character
examples, matching the corrected v3.x EN page.
## Cluster verification (Doris 2.1.11-rc01)
```
SELECT APPEND_TRAILING_CHAR_IF_ABSENT('a', 'c'); -> ac
SELECT APPEND_TRAILING_CHAR_IF_ABSENT('ac', 'c'); -> ac
SELECT APPEND_TRAILING_CHAR_IF_ABSENT('', '/'); -> /
SELECT APPEND_TRAILING_CHAR_IF_ABSENT(NULL, 'c'); -> NULL
SELECT APPEND_TRAILING_CHAR_IF_ABSENT('acf', 'ṛ'); -> acfṛ
-- and confirming the removed case is wrong:
SELECT APPEND_TRAILING_CHAR_IF_ABSENT('ac', 'cd'); -> NULL (doc
previously said 'accd')
```
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-authored-by: Claude Opus 4.8 (1M context) <[email protected]>
---
.../append-trailing-char-if-absent.md | 64 +++++++++++++++++++---
.../append-trailing-char-if-absent.md | 64 +++++++++++++++++++---
2 files changed, 112 insertions(+), 16 deletions(-)
diff --git
a/i18n/zh-CN/docusaurus-plugin-content-docs/version-2.1/sql-manual/sql-functions/scalar-functions/string-functions/append-trailing-char-if-absent.md
b/i18n/zh-CN/docusaurus-plugin-content-docs/version-2.1/sql-manual/sql-functions/scalar-functions/string-functions/append-trailing-char-if-absent.md
index 4dcf3c2f88f..73d339b4cb2 100644
---
a/i18n/zh-CN/docusaurus-plugin-content-docs/version-2.1/sql-manual/sql-functions/scalar-functions/string-functions/append-trailing-char-if-absent.md
+++
b/i18n/zh-CN/docusaurus-plugin-content-docs/version-2.1/sql-manual/sql-functions/scalar-functions/string-functions/append-trailing-char-if-absent.md
@@ -29,14 +29,62 @@ APPEND_TRAILING_CHAR_IF_ABSENT ( <str> , <trailing_char> )
## 举例
-``` sql
-SELECT
APPEND_TRAILING_CHAR_IF_ABSENT('a','c'),APPEND_TRAILING_CHAR_IF_ABSENT('ac',
'c'),APPEND_TRAILING_CHAR_IF_ABSENT('ac', 'cd')
+1. 基本用法：结尾字符不存在时进行添加
+```sql
+SELECT APPEND_TRAILING_CHAR_IF_ABSENT('a', 'c');
+```
+```text
++------------------------------------------+
+| APPEND_TRAILING_CHAR_IF_ABSENT('a', 'c') |
++------------------------------------------+
+| ac |
++------------------------------------------+
+```
+
+2. 结尾字符已存在，不重复添加
+```sql
+SELECT APPEND_TRAILING_CHAR_IF_ABSENT('ac', 'c');
+```
+```text
++-------------------------------------------+
+| APPEND_TRAILING_CHAR_IF_ABSENT('ac', 'c') |
++-------------------------------------------+
+| ac |
++-------------------------------------------+
+```
+
+3. 空字符串处理
+```sql
+SELECT APPEND_TRAILING_CHAR_IF_ABSENT('', '/');
+```
+```text
++-----------------------------------------+
+| APPEND_TRAILING_CHAR_IF_ABSENT('', '/') |
++-----------------------------------------+
+| / |
++-----------------------------------------+
+```
+
+4. NULL 值处理
+```sql
+SELECT APPEND_TRAILING_CHAR_IF_ABSENT(NULL, 'c');
+```
+```text
++-------------------------------------------+
+| APPEND_TRAILING_CHAR_IF_ABSENT(NULL, 'c') |
++-------------------------------------------+
+| NULL |
++-------------------------------------------+
```
-```text
-+------------------------------------------+-------------------------------------------+--------------------------------------------+
-| append_trailing_char_if_absent('a', 'c') |
append_trailing_char_if_absent('ac', 'c') |
append_trailing_char_if_absent('ac', 'cd') |
-+------------------------------------------+-------------------------------------------+--------------------------------------------+
-| ac | ac
| accd |
-+------------------------------------------+-------------------------------------------+--------------------------------------------+
+5. UTF-8 字符
+```sql
+SELECT APPEND_TRAILING_CHAR_IF_ABSENT('acf', 'ṛ');
+```
+```text
++----------------------------------------------+
+| APPEND_TRAILING_CHAR_IF_ABSENT('acf', 'ṛ') |
++----------------------------------------------+
+| acfṛ |
++----------------------------------------------+
```
diff --git
a/versioned_docs/version-2.1/sql-manual/sql-functions/scalar-functions/string-functions/append-trailing-char-if-absent.md
b/versioned_docs/version-2.1/sql-manual/sql-functions/scalar-functions/string-functions/append-trailing-char-if-absent.md
index 4380cb61be4..aa45540c7f3 100644
---
a/versioned_docs/version-2.1/sql-manual/sql-functions/scalar-functions/string-functions/append-trailing-char-if-absent.md
+++
b/versioned_docs/version-2.1/sql-manual/sql-functions/scalar-functions/string-functions/append-trailing-char-if-absent.md
@@ -29,14 +29,62 @@ Parameters The string after concatenation of `<str>` and
`<trailing_char>` (if `
## Example
-``` sql
-SELECT
APPEND_TRAILING_CHAR_IF_ABSENT('a','c'),APPEND_TRAILING_CHAR_IF_ABSENT('ac',
'c'),APPEND_TRAILING_CHAR_IF_ABSENT('ac', 'cd')
+1. Basic usage: Add character when it doesn't exist
+```sql
+SELECT APPEND_TRAILING_CHAR_IF_ABSENT('a', 'c');
+```
+```text
++------------------------------------------+
+| APPEND_TRAILING_CHAR_IF_ABSENT('a', 'c') |
++------------------------------------------+
+| ac |
++------------------------------------------+
+```
+
+2. Character already exists, don't add
+```sql
+SELECT APPEND_TRAILING_CHAR_IF_ABSENT('ac', 'c');
+```
+```text
++-------------------------------------------+
+| APPEND_TRAILING_CHAR_IF_ABSENT('ac', 'c') |
++-------------------------------------------+
+| ac |
++-------------------------------------------+
+```
+
+3. Empty string handling
+```sql
+SELECT APPEND_TRAILING_CHAR_IF_ABSENT('', '/');
+```
+```text
++-----------------------------------------+
+| APPEND_TRAILING_CHAR_IF_ABSENT('', '/') |
++-----------------------------------------+
+| / |
++-----------------------------------------+
+```
+
+4. NULL value handling
+```sql
+SELECT APPEND_TRAILING_CHAR_IF_ABSENT(NULL, 'c');
+```
+```text
++-------------------------------------------+
+| APPEND_TRAILING_CHAR_IF_ABSENT(NULL, 'c') |
++-------------------------------------------+
+| NULL |
++-------------------------------------------+
```
-```text
-+------------------------------------------+-------------------------------------------+--------------------------------------------+
-| append_trailing_char_if_absent('a', 'c') |
append_trailing_char_if_absent('ac', 'c') |
append_trailing_char_if_absent('ac', 'cd') |
-+------------------------------------------+-------------------------------------------+--------------------------------------------+
-| ac | ac
| accd |
-+------------------------------------------+-------------------------------------------+--------------------------------------------+
+5. UTF-8 character
+```sql
+SELECT APPEND_TRAILING_CHAR_IF_ABSENT('acf', 'ṛ');
+```
+```text
++----------------------------------------------+
+| APPEND_TRAILING_CHAR_IF_ABSENT('acf', 'ṛ') |
++----------------------------------------------+
+| acfṛ |
++----------------------------------------------+
```
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