boluor opened a new pull request, #3848:
URL: https://github.com/apache/doris-website/pull/3848
## Summary
Mechanical port of the 4.x fixes in #3833, #3837, #3838, #3839 to
dev/master. Verified against today's master build (selectdb-qa-test tarball).
**Skipped** (already applied on dev):
- strleft.md ZH dedup (#3837)
- milliseconds-add.md EN BIGINT-range example (#3834 EN-side; the ZH
duplicate-removal piece is in the sibling PR)
## Files (13)
### EN string-functions
- **from-base64.md, instr.md, length.md, locate.md, lpad.md** — backport
corner-case examples (NULL / empty / multi-byte UTF-8 / numeric / etc.) added
in #3833
- **rtrim.md** — add the LENGTH-based 'default-only-strips-ASCII-space'
example (#3837)
- **substring.md** — add the missing 'empty source string' example + 'NULL
passed directly' (#3839)
- **trim.md** — replace example 2's prose + expected output
(`trim('ababccaab', 'ab')` is `cca`, not `ababcca` — trim repeatedly strips
from both ends), plus the UTF-8 multi-byte-pattern example (#3839)
### EN other-functions
- **field.md** — full replace with 4.x post-fix version: adds CREATE TABLE
setup for `baseall` and `class_test` (which the page references but never
created), adds a NULL row to `class_test`, adds DESC and NULLS FIRST examples
that exercise NULL handling (#3789 + #3839 combined)
### ZH
- **field.md** — add the simple `SELECT FIELD(2, 3, 1, 2, 5)` example (#3839)
- **ltrim.md** — rewrite example 3 with correct expected output; LTRIM
strips ASCII space only, NOT `\t`/`\n`, so the result still contains the
tab/newline. Switched to a LENGTH() comparison for clarity (#3838)
- **substring.md** — add the SUBSTR alias example (#3839)
- **trim.md** — add three examples (no-match returns original; repeated
pattern strips until exhausted; asymmetric removal with multi-char pattern).
Also drop a trailing `;;` typo (#3839)
## Verification
Verified end-to-end against today's master cluster — all added / modified
examples behave identically on master as on 4.1.1, so the doc fixes apply
unchanged.
## Related 4.x PRs
#3833 #3837 #3838 #3839 (and #3789 for the field.md setup blocks).
🤖 Generated with [Claude Code](https://claude.com/claude-code)
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