boluor opened a new pull request, #3858:
URL: https://github.com/apache/doris-website/pull/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)
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