Haisheng Yuan

Bellevue, Washington, United States

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Summary

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Rockstar

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Top School

Haisheng Yuan is a software engineer with 10 years of experience specializing in MPP OLAP databases, query processing, optimization, execution, and distributed big data systems. Based in Bellevue, WA, he combines deep research-level understanding with practical engineering, evidenced by targeted contributions to Apache Calcite that fixed aggregation, expression-simplification, and caching issues to improve SQL processing stability and performance. He is an active open-source contributor and informal technical leader who focuses on core database internals rather than surface tooling. Trained in automation (BE) and information technology (MS from Carnegie Mellon), Haisheng brings a methodical, systems-oriented approach to solving complex query and distributed systems problems.

10 years of coding experience

Bachelor of Engineering - BE, Automation, Bachelor of Engineering - BE, Automation at Donghua University

Master of Science - MS, Information Technology, Master of Science - MS, Information Technology at Carnegie Mellon University

Japanese, English, Chinese

Github Skills (12)

apache-calcite10

javas10

query-optimization10

sql10

calc10

java10

big-data9

datastructures-algorithms8

algorithms8

data-structures8

algorithm8

data-structure8

Programming languages (9)

JavaC++CSSShellCMakefilePLpgSQLGo

Github contributions (5)

apache/calcite

Apr 2018 - Oct 2021

Apache Calcite

Role in this project:

Back-end Developer

Contributions:52 reviews, 90 commits, 289 PRs in 3 years 6 months

Contributions summary:Haisheng contributed to Apache Calcite by addressing bugs and enhancing the system's SQL processing capabilities. Their work focused on improving the AggregateJoinTransposeRule, specifically resolving issues with splitting aggregate calls and handling distinct rows. They also fixed an assertion error in expression simplification and addressed a memory leak caused by caching traits, improving overall performance and stability. The contributions demonstrate a focus on query optimization and the core functionality of the database system.

geospatialapache-calcitesqlapachebig-data

hsyuan/calcite

Apr 2018 - Jul 2020

Mirror of Apache Calcite

Contributions:249 pushes, 138 branches in 2 years 3 months

javaapacheapache-calcitecalcite

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