PostgreSQL Significant Contributor — 3rd from China to be recognized
Apache Cloudberry Founding Member & PPMC · Greenplum Committer · PostgreSQL ACE (China)
Database kernel developer · PostgreSQL internals · Query optimization · Parallel execution · MPP distributed systems
Significant Contributor · Acknowledged in PG 15 / 16 / 17 / 18 release notes · Patch reviewer on pgsql-hackers
Commits merged into PostgreSQL main branch covering planner optimization, COPY enhancement, GIN index correctness, and hash operation crash fixes.
View selected commits
Features:
- Add support for LIKE in CREATE FOREIGN TABLE
- Detect redundant GROUP BY columns using UNIQUE indexes
- Provide FORCE_NULL * and FORCE_NOT_NULL * options for COPY FROM
Bug/Crash Fixes:
- Fix ordering issue with WAL operations in GIN fast insert path
- Avoid misbehavior when hash_table_bytes < bucket_size
- Disallow setting MAX_PARTITION_BUFFERS to less than 2
Code Cleanups:
Founding member and historically the top committer by volume. Sole or principal author of multiple major features. A significant portion of development was completed before the project was open-sourced. Contributed to virtually every subsystem: planner, executor, storage, catalog, distributed transactions, libpq.
AQUMV — Answer Query Using Materialized Views (Sole Author) — Core PR Automatic planner-level query rewriting that transparently serves queries from materialized views. Supports GROUP BY, GROUPING SETS, ROLLUP, CUBE, HAVING, DISTINCT, DISTINCT ON, ORDER BY, LIMIT/OFFSET/FETCH.
Parallel Query (Principal Author) — View PRs Designed intra-node parallel execution with new locus types (HashWorkers, SegmentGeneralWorkers). Implemented parallel Hash/Nested-Loop/Merge Join, parallel AO/AOCS scan, parallel CTAS, parallel REFRESH MV, parallel DISTINCT and UNION.
Dynamic Tables — PR Auto-maintained materialized views integrated with AQUMV for real-time analytical acceleration.
All major PRs
AQUMV (19 PRs): #298 · #322 · #342 · #354 · #358 · #439 · #441 · #446 · #501 · #528 · #682 · #705 · #786 · #965 · #990 · #1029 · #1098 · #1117 · #1143
Parallel Query: #30 · #98 · #130 · #149 · #248 · #284 · #365 · #530 · #653 · #1173 · #1213
Greenplum Committer. Architected and rewrote GPSS (Greenplum Streaming Server) — #2 contributor by code volume (55K+ lines changed).
Selected critical fixes
| 第三位中国成员！张明礼入选 PostgreSQL Contributor | 3rd from China recognized as PG Contributor |
| PostgreSQL 16 中国贡献者专访：张明礼 | PG 16 China contributor interview |
| PostgreSQL全球开发组公布 New Contributors | PG Global Dev Group new contributors |
| PostgreSQL 15发布 HashData贡献关键力量 | PG 15 release — HashData contributions |
| 从单进程到并行化：AO表并行扫描内核解析 | Parallelizing AO table scans |
| Postgres内核代码100万行，怎么读? | How to read 1M lines of PG code |
| 探索Greenplum/Cloudberry：MPP数据加载 | MPP data loading |
| CloudberryDB并行化查询之路 🎬 | Parallel query in CloudberryDB |
| AQUMV：物化视图查询改写 🎬 | Answer Query Using Materialized Views |