apache/incubator-gluten
Nov 2024 – Sep 2025
5 Months active
Languages Used
C++JavaScalaCMakeYAML
Technical Skills
Backend DevelopmentCachingClickHouseData EngineeringDelta LakeDistributed Systems
Zhichao Zhang
PROFILE
Zhichao Zhang
Zhangzc contributed to the apache/incubator-gluten repository by engineering robust backend features and stability improvements for data lakehouse workloads. Over five months, Zhangzc delivered end-to-end Delta Lake Deletion Vector support in the ClickHouse backend, enhanced metadata handling, and expanded data source compatibility with Iceberg read integration. Their work involved deep C++ and Scala development, careful CI/CD workflow updates, and rigorous testing to ensure data integrity and runtime stability, including JDK 17 compatibility via JNI resource management. By addressing complex query optimization, caching, and backend compilation issues, Zhangzc demonstrated strong backend development skills and a thorough understanding of distributed data systems.
Overall Statistics
Feature vs Bugs
60%Features
Repository Contributions
12Total
Bugs
4
Commits
12
Features
6
Lines of code
5,541
Activity Months5
Your Network
766 peopleSame Organization
@apache.org654
a.huberMember
Akira AjisakaMember
Andrzej BiałeckiMember
Arturo BernalMember
Abhishek KumarMember
Attila BukorMember
VampireAchaoMember
Abhishek ChennakaMember
Andreas DangelMember
Work History
September 2025
1 Commits
Sep 1, 2025In September 2025, stabilized the ClickHouse backend in the apache/incubator-gluten repository by delivering a hotfix that fixes a compile error and fortifies the CI build to accommodate newly added directories. The changes ensure the ClickHouse backend can be compiled in CI, enabling reliable testing and downstream development across components.
1 Commits
Sep 1, 2025In September 2025, stabilized the ClickHouse backend in the apache/incubator-gluten repository by delivering a hotfix that fixes a compile error and fortifies the CI build to accommodate newly added directories. The changes ensure the ClickHouse backend can be compiled in CI, enabling reliable testing and downstream development across components.
September 2025
May 2025
2 Commits • 1 Features
May 1, 2025May 2025 monthly summary for apache/incubator-gluten: Delivered end-to-end Delta Lake Deletion Vectors support in the ClickHouse backend (MergeTree), including enhanced metadata handling, exposure of new virtual columns, and integration of a transformation step in the execution pipeline. Implemented comprehensive unit tests for purge behavior with deletion vectors, including partitioned tables, to verify correct cleanup of old files and ensure data integrity. Added tests for the 'reorg' command in MergeTree with Delta DV to validate stability during reorganizations. These changes improve storage efficiency, data integrity, and Delta Lake interoperability, strengthening the product's value proposition for data-lake workloads.
May 2025
2 Commits • 1 Features
May 1, 2025May 2025 monthly summary for apache/incubator-gluten: Delivered end-to-end Delta Lake Deletion Vectors support in the ClickHouse backend (MergeTree), including enhanced metadata handling, exposure of new virtual columns, and integration of a transformation step in the execution pipeline. Implemented comprehensive unit tests for purge behavior with deletion vectors, including partitioned tables, to verify correct cleanup of old files and ensure data integrity. Added tests for the 'reorg' command in MergeTree with Delta DV to validate stability during reorganizations. These changes improve storage efficiency, data integrity, and Delta Lake interoperability, strengthening the product's value proposition for data-lake workloads.
April 2025
1 Commits • 1 Features
Apr 1, 2025April 2025 monthly summary for apache/incubator-gluten: Delivered JDK 17 compatibility for the ClickHouse backend, including updates to JNI OnUnLoad handling and the introduction of destroyNative to explicitly release native resources, improving stability and preventing core dumps. This work aligns with GLUTEN-9239 and CH backend support (#9242).
1 Commits • 1 Features
Apr 1, 2025April 2025 monthly summary for apache/incubator-gluten: Delivered JDK 17 compatibility for the ClickHouse backend, including updates to JNI OnUnLoad handling and the introduction of destroyNative to explicitly release native resources, improving stability and preventing core dumps. This work aligns with GLUTEN-9239 and CH backend support (#9242).
April 2025
March 2025
4 Commits • 2 Features
Mar 1, 2025March 2025 monthly summary highlighting key features delivered, major bugs fixed, and overall impact for the apache/incubator-gluten project. Focused on improving data reading correctness and test coverage across backends and formats, driving reliability for lakehouse workloads.
March 2025
4 Commits • 2 Features
Mar 1, 2025March 2025 monthly summary highlighting key features delivered, major bugs fixed, and overall impact for the apache/incubator-gluten project. Focused on improving data reading correctness and test coverage across backends and formats, driving reliability for lakehouse workloads.
November 2024
4 Commits • 2 Features
Nov 1, 2024Concise monthly summary for 2024-11 focused on delivering robust data processing features, stabilizing cache behavior, and expanding data source capabilities in the Gluten project (apache/incubator-gluten).
4 Commits • 2 Features
Nov 1, 2024Concise monthly summary for 2024-11 focused on delivering robust data processing features, stabilizing cache behavior, and expanding data source capabilities in the Gluten project (apache/incubator-gluten).
November 2024
Activity
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Quality Metrics
Correctness90.8%
Maintainability85.0%
Architecture86.0%
Performance84.2%
AI Usage20.0%
Skills & Technologies
Programming Languages
C++CMakeJavaScalaYAML
Technical Skills
Backend DevelopmentBig DataBitmapsC++CI/CDCMakeCachingClickHouseData EngineeringData StructuresDatabase InternalsDelta LakeDistributed SystemsIcebergJDK Compatibility
Repositories Contributed To
Overview of all repositories you've contributed to across your timeline