Fan Kun
China
Summary
🤩
RockstarFan Kun is a back-end developer and database engineer with seven years of hands-on experience building and optimizing distributed analytics systems. Based in China and currently a graduate student, he contributes to high-profile open-source projects like Databend and OceanBase, focusing on aggregation performance, two-level hashtable implementations, and log/persistence improvements. His work spans low-level database internals—PALF, data dictionary handling, and HTTP planner integration—demonstrating both systems thinking and practical bug-fixing at scale. Colleagues can rely on him to refactor complex code paths and introduce targeted features such as array-length utilities and configurable aggregation strategies. He combines academic curiosity with production-grade engineering, often improving performance-critical components that enable massive-scale analytics. Notably, his contributions touch databases used for cost-effective analytics and enterprise-grade distributed SQL, showing an ability to impact both cloud-native analytics and mission-critical storage.
8 years of coding experience
Github Skills (17)
c-language10
databases10
query-optimization10
aggregations10
hashtable10
logging10
rust10
cprogramming-language10
distributed-database10
relational-databases10
sql-database10
database10
mysql9
data-structures8
data-structure8
Programming languages (6)
Github contributions (5)
databendlabs/databend
May 2022 - Jul 2022
Data Agent Ready Warehouse : One for Analytics, Search, AI, Python Sandbox. — rebuilt from scratch. Unified architecture on your S3.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:96 reviews, 98 commits, 29 PRs in 2 months
Contributions summary:Fan's commits primarily focus on implementing and improving group-by functionality within the Databend database. These changes include supporting two-level hashtables for aggregation, adding settings to control when to switch to a two-level approach, and fixing related bugs. The user also appears to have refactored code and added a new function for calculating array lengths. The user also worked on improving the HTTP handler to support the new planner.
aipythonrustdatabaseserverless
oceanbase/oceanbase
Nov 2021 - Nov 2021
OceanBase is the unified distributed database for the AI era — open-source, multi-model, one engine for your most demanding workloads.
Role in this project:Back-end Developer & Database Engineer
Back-end Developer & Database EngineerContributions:1 commit, 1 PR, 9 comments in 1 day
Contributions summary:Fan primarily focused on optimizing the OceanBase database, addressing issues within the PALF (Persistent Application Log File) and other core components. Their contributions include improving log group policies, fixing errors in log size statistics, and resolving problems related to sliding windows and task management. They also made several code changes related to data dictionary and hbase table handling, adding functionality to support them.
aidistributed-databaseoceanbasepaxoshtap
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