[fix](doc) small A-disjoint backports: substring/intersect-count examples + url-encode zh fence#3816
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[fix](doc) small A-disjoint backports: substring/intersect-count examples + url-encode zh fence#3816boluor wants to merge 1 commit into
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…ples + url-encode zh fence Three small cross-port fixes that share the same "minimum-impact" shape: - versioned_docs/.../string-functions/substring.md (EN +1): Add an "Empty source string" example that ZH already has, demonstrating that substring of '' returns ''. - versioned_docs/.../aggregate-functions/intersect-count.md (EN +1): Add the two-day intersection example showing the function counts bitmap intersection across multiple filter values; ZH already had this. - i18n/zh-CN/.../string-functions/url-encode.md (ZH fence fix): The result block was fenced as ```sql instead of ```text, so docs syntax-highlights an ASCII grid as SQL. Drop the spurious blank line inside the result block while I'm there. All three additions/changes were re-run on Apache Doris 4.1.1 and the result blocks are the verbatim mysql client output. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Summary
Three small cross-port fixes in one PR; each is a minimum-impact change.
Verification
```
mysql> SELECT substring('', 1, 3); -- ''
mysql> select intersect_count(user_id,dt,20250801,20250802) from pv_bitmap; -- 1
```
Both run on a single-node Apache Doris 4.1.1 cluster against a freshly-recreated `pv_bitmap` table seeded with the doc's own INSERT.
Test plan
🤖 Generated with Claude Code