Jkย Xu
Partner, Sales Manager at Casin Industrial Co
Guangdong Province, China
Summary
๐คฉ
RockstarJk Xu is a partner and sales manager based in Guangdong with over two decades leading electronic design, OEM/ODM manufacturing, and prototype services for multi-material products. He combines business development and R&D oversight at Casin Industrial, enabling custom product design under NDA and end-to-end manufacturing. In parallel he contributes as a backend developer to major open-source analytical databasesโTiDB and Databendโfocusing on query planner and execution engine optimizations, aggregation strategies, and memory-efficient joins. This blend of hands-on hardware manufacturing leadership and deep database internals work gives him a rare cross-domain perspective on product engineering and scalable system performance.
6 years of coding experience
Github Skills (21)
algorithm10
algorithms10
mysql10
databases10
query-optimization10
mysqli10
go10
sql10
hashtable10
rust10
distributed-database10
database10
data-structure9
missionplanner9
tidb9
Programming languages (5)
Github contributions (5)
databendlabs/databend
Mar 2023 - Mar 2025
๐๐ฎ๐๐ฎ, ๐๐ป๐ฎ๐น๐๐๐ถ๐ฐ๐ & ๐๐. Modern alternative to Snowflake. Cost-effective and simple for massive-scale analytics. https://databend.com
Role in this project:
Back-end Developer
Back-end DeveloperContributions:432 reviews, 277 PRs, 10 pushes in 2 years
Contributions summary:Jk's contributions primarily focused on improving the performance and functionality of the query planner, particularly concerning aggregation and join operations. Their work involved implementing and optimizing eager aggregation techniques, including support for different aggregation patterns and cost modeling. Additionally, the user contributed to the optimization of hash join, including enhancements to the probe phase, handling of null values, and memory usage reduction.
serverlesslow-costdata-warehousestoragequery-processing
pingcap/tidb
Jan 2023 - Jan 2023
TiDB - the open-source, cloud-native, distributed SQL database designed for modern applications.
Role in this project:Backend Developer
Backend DeveloperContributions:7 reviews, 3 commits, 7 PRs in 15 days
Contributions summary:Jk contributed to the TiDB database, focusing on performance, bug fixes, and enhancements to the query planner and execution engine. They addressed issues related to auto-increment handling in the executor, fixed a typo in the planner, and added locking mechanisms within the autoid allocator. Furthermore, they contributed to the query planner, addressing issues related to pushing down TopN operators and stream aggregation. The contributions suggest expertise in database internals and optimization within the TiDB architecture.
ai-poweredtidbserverlesshtapreal-time
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