boluor opened a new pull request, #3744:
URL: https://github.com/apache/doris-website/pull/3744
## Summary
The `GROUP_CONCAT` page syntax already advertises `[ORDER BY
{<col_name>|<expr>} [ASC|DESC]]`, but the Examples section on 2.1/3.x only
showed the basic and `DISTINCT` forms, so a reader couldn't see how `ORDER BY`
actually attaches *inside* `GROUP_CONCAT`. The current/4.x pages already carry
two ORDER BY examples — backport them to 2.1/3.x (EN + zh).
Added examples (matching the form already shipped in current/4.x):
```sql
select GROUP_CONCAT(value ORDER BY value DESC) from test;
-- => "c, c, b, a"
select GROUP_CONCAT(DISTINCT value ORDER BY value DESC) from test;
-- => "c, b, a"
```
## Test plan
- [x] All 4 backported files now have 6 `GROUP_CONCAT(...)` example calls,
matching current/4.x.
- [x] Dead-link check passes.
- [ ] CI build.
Closes #3487
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