boluor opened a new pull request, #3855:
URL: https://github.com/apache/doris-website/pull/3855
## Problem
The ZH page kept an older combined example whose third call,
`APPEND_TRAILING_CHAR_IF_ABSENT('ac', 'cd')`, was documented as returning
`accd`. That is wrong: `<trailing_char>` is a **single** trailing character,
and passing a 2-character string returns `NULL` on the server.
The EN page was already rewritten into five focused single-character
examples; this PR brings ZH in line with EN (EN is the reference and is
unchanged).
## Cluster verification (Doris 3.1.4-rc02)
Actual output, pasted into the doc:
```
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
```
Confirming the removed case is genuinely wrong:
```
SELECT APPEND_TRAILING_CHAR_IF_ABSENT('ac', 'cd'); -> NULL (doc
previously said 'accd')
```
🤖 Generated with [Claude Code](https://claude.com/claude-code)
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