apache/incubator-gluten
Oct 2024 – Jun 2025
9 Months active
Languages Used
C++JavaScalaShellPropertiesCMakeMarkdown
Technical Skills
Backend DevelopmentBug FixingClickHouseCommit ProtocolsData EngineeringData Processing
Chang chen
PROFILE
Chang Chen
Chang Chen contributed to the apache/incubator-gluten repository by engineering backend features and stability improvements for distributed data processing. Over nine months, he developed and optimized write paths for MergeTree tables, enhanced Delta Lake and Iceberg integration, and improved object storage configuration for HDFS and S3. Using C++, Java, and CMake, Chang refactored core components to boost performance, implemented robust delete handling for Iceberg, and streamlined configuration management to reduce runtime errors. His work included targeted bug fixes, test infrastructure enhancements, and build system flexibility, resulting in a more reliable, maintainable, and storage-agnostic backend for Spark and ClickHouse workloads.
Overall Statistics
Feature vs Bugs
59%Features
Repository Contributions
31Total
Bugs
12
Commits
31
Features
17
Lines of code
49,450
Activity Months9
Your Network
110 people
Work History
June 2025
1 Commits
Jun 1, 2025Month 2025-06 – Focused stability work in apache/incubator-gluten. No new features released. The primary effort was reverting the RichSparkConf changes to restore pre-change interop behavior and maintain gluten configuration stability. This rollback reduced runtime risk, preserved compatibility for downstream workloads, and enabled safe continuation of feature work in subsequent sprints.
1 Commits
Jun 1, 2025Month 2025-06 – Focused stability work in apache/incubator-gluten. No new features released. The primary effort was reverting the RichSparkConf changes to restore pre-change interop behavior and maintain gluten configuration stability. This rollback reduced runtime risk, preserved compatibility for downstream workloads, and enabled safe continuation of feature work in subsequent sprints.
June 2025
May 2025
4 Commits • 3 Features
May 1, 2025May 2025 monthly summary for the apache/incubator-gluten project highlighting delivery, reliability, and storage-agnostic capabilities. Key work shipped includes test infrastructure improvements for Gluten, a flexible build system enabling symbolic linking for libraries, and enhanced object storage configuration with expanded TPCH test coverage. A notable bug fix cleaned up GlutenDiskS3 by removing an unnecessary readFile override, reducing maintenance risk and potential runtime issues. These changes, along with Delta-optimized writer options and improved HDFS URL handling in tests, collectively improve test reliability, build reproducibility, and storage-path coverage, accelerating safe deployment to HDFS/S3 environments and enabling faster iteration.
May 2025
4 Commits • 3 Features
May 1, 2025May 2025 monthly summary for the apache/incubator-gluten project highlighting delivery, reliability, and storage-agnostic capabilities. Key work shipped includes test infrastructure improvements for Gluten, a flexible build system enabling symbolic linking for libraries, and enhanced object storage configuration with expanded TPCH test coverage. A notable bug fix cleaned up GlutenDiskS3 by removing an unnecessary readFile override, reducing maintenance risk and potential runtime issues. These changes, along with Delta-optimized writer options and improved HDFS URL handling in tests, collectively improve test reliability, build reproducibility, and storage-path coverage, accelerating safe deployment to HDFS/S3 environments and enabling faster iteration.
April 2025
3 Commits • 2 Features
Apr 1, 2025April 2025 monthly summary for apache/incubator-gluten focusing on business value and technical achievements. Key outcomes include performance and reliability gains in Iceberg read paths through delete-operation benchmarking and test infrastructure enhancements, Java 17 compatibility preparations by removing deprecated JNI_OnUnload, and stabilization of MinIO read scenarios with improved test infrastructure. These efforts collectively improve data correctness, test stability, and readiness for Java 17 environments.
3 Commits • 2 Features
Apr 1, 2025April 2025 monthly summary for apache/incubator-gluten focusing on business value and technical achievements. Key outcomes include performance and reliability gains in Iceberg read paths through delete-operation benchmarking and test infrastructure enhancements, Java 17 compatibility preparations by removing deprecated JNI_OnUnload, and stabilization of MinIO read scenarios with improved test infrastructure. These efforts collectively improve data correctness, test stability, and readiness for Java 17 environments.
April 2025
March 2025
2 Commits • 1 Features
Mar 1, 2025March 2025 performance summary for apache/incubator-gluten: Highlights include delivering Iceberg positional deletes support with a refactored reader and new delete-management classes, and stabilizing Spark integration by reverting the map_filter enablement. This work improves data correctness for Iceberg workloads, reduces risk from experimental features, and lays the groundwork for robust delete handling across formats.
March 2025
2 Commits • 1 Features
Mar 1, 2025March 2025 performance summary for apache/incubator-gluten: Highlights include delivering Iceberg positional deletes support with a refactored reader and new delete-management classes, and stabilizing Spark integration by reverting the map_filter enablement. This work improves data correctness for Iceberg workloads, reduces risk from experimental features, and lays the groundwork for robust delete handling across formats.
February 2025
4 Commits • 3 Features
Feb 1, 2025February 2025 monthly summary for apache/incubator-gluten: In this month, we delivered three key features that enhance data processing and reliability, fixed critical gaps in delete handling, and cleaned CI/testing to support Spark 3.5. The work is aligned with business value by boosting Parquet processing efficiency, ensuring data integrity in Iceberg workflows, and speeding up CI pipelines for faster iteration across teams.
4 Commits • 3 Features
Feb 1, 2025February 2025 monthly summary for apache/incubator-gluten: In this month, we delivered three key features that enhance data processing and reliability, fixed critical gaps in delete handling, and cleaned CI/testing to support Spark 3.5. The work is aligned with business value by boosting Parquet processing efficiency, ensuring data integrity in Iceberg workflows, and speeding up CI pipelines for faster iteration across teams.
February 2025
January 2025
2 Commits
Jan 1, 2025January 2025 monthly summary: Stabilized configuration access across backends and improved embedded compiler build reliability for the gluten project (apache/incubator-gluten). Reverted experimental ConfigEntry changes and migrated to GlutenConfig.getConf to ensure consistent configuration access across environments. Fixed build configuration for the embedded compiler by removing an unnecessary include and conditionally including LLVM headers based on build settings. These changes reduce runtime configuration errors, improve cross-backend stability, and enhance portability of embedded builds, delivering clearer maintainability and lower production risk.
January 2025
2 Commits
Jan 1, 2025January 2025 monthly summary: Stabilized configuration access across backends and improved embedded compiler build reliability for the gluten project (apache/incubator-gluten). Reverted experimental ConfigEntry changes and migrated to GlutenConfig.getConf to ensure consistent configuration access across environments. Fixed build configuration for the embedded compiler by removing an unnecessary include and conditionally including LLVM headers based on build settings. These changes reduce runtime configuration errors, improve cross-backend stability, and enhance portability of embedded builds, delivering clearer maintainability and lower production risk.
December 2024
7 Commits • 4 Features
Dec 1, 2024Concise monthly summary for 2024-12 focusing on business value and technical achievements in the apache/incubator-gluten repository. The team delivered performance-oriented features, stabilized the codebase, and enhanced observability to accelerate debugging and customer value realization. Highlights include partitioned writes optimization, data statistics enhancements, improved Spark SQL integration, better logging for debugging, and build/test reliability improvements.
7 Commits • 4 Features
Dec 1, 2024Concise monthly summary for 2024-12 focusing on business value and technical achievements in the apache/incubator-gluten repository. The team delivered performance-oriented features, stabilized the codebase, and enhanced observability to accelerate debugging and customer value realization. Highlights include partitioned writes optimization, data statistics enhancements, improved Spark SQL integration, better logging for debugging, and build/test reliability improvements.
December 2024
November 2024
6 Commits • 3 Features
Nov 1, 2024November 2024 (2024-11) monthly summary for apache/incubator-gluten. This period focused on delivering high-impact features to improve data ingestion throughput, reliability, and observability, while addressing critical ORC reading correctness and plan-processing stability. Delivered significant backend write efficiency improvements through a one-pipeline architecture for MergeTree and partitioned Mergetrees, enhanced Delta Lake write workflows with native statistics collection, and tightened ORC/ClickHouse integration with targeted fixes and revert of an earlier type-ignoring change. These efforts reduce data latency, minimize test failures, and provide a stronger foundation for Spark 3.5 pipelines and ClickHouse compatibility.
November 2024
6 Commits • 3 Features
Nov 1, 2024November 2024 (2024-11) monthly summary for apache/incubator-gluten. This period focused on delivering high-impact features to improve data ingestion throughput, reliability, and observability, while addressing critical ORC reading correctness and plan-processing stability. Delivered significant backend write efficiency improvements through a one-pipeline architecture for MergeTree and partitioned Mergetrees, enhanced Delta Lake write workflows with native statistics collection, and tightened ORC/ClickHouse integration with targeted fixes and revert of an earlier type-ignoring change. These efforts reduce data latency, minimize test failures, and provide a stronger foundation for Spark 3.5 pipelines and ClickHouse compatibility.
October 2024
2 Commits • 1 Features
Oct 1, 2024For 2024-10, delivered key features and bug fixes in apache/incubator-gluten, focusing on durability, performance, and query correctness in the MergeTree path. Major deliverables include introducing the MergeTree Delayed Commit Protocol to improve write durability and throughput, and fixing the page index reader when evaluating OR conditions to ensure correct NOT/NOT_IN/ALWAYS_TRUE/FALSE handling, with extended tests. These changes reduce write latency under load, improve recovery guarantees, and enhance OR-conditional query reliability. The work demonstrates strong refactoring, modularization of the write path (including ClickhouseOptimisticTransaction, OptimizeTableCommandOverwrites, and multiple file format writers), targeted testing, and a commitment to code quality and performance.
2 Commits • 1 Features
Oct 1, 2024For 2024-10, delivered key features and bug fixes in apache/incubator-gluten, focusing on durability, performance, and query correctness in the MergeTree path. Major deliverables include introducing the MergeTree Delayed Commit Protocol to improve write durability and throughput, and fixing the page index reader when evaluating OR conditions to ensure correct NOT/NOT_IN/ALWAYS_TRUE/FALSE handling, with extended tests. These changes reduce write latency under load, improve recovery guarantees, and enhance OR-conditional query reliability. The work demonstrates strong refactoring, modularization of the write path (including ClickhouseOptimisticTransaction, OptimizeTableCommandOverwrites, and multiple file format writers), targeted testing, and a commitment to code quality and performance.
October 2024
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Quality Metrics
Correctness85.8%
Maintainability84.0%
Architecture85.0%
Performance79.0%
AI Usage20.0%
Skills & Technologies
Programming Languages
C++CMakeJavaMarkdownPropertiesScalaShell
Technical Skills
Backend DevelopmentBackend IntegrationBenchmarkingBig DataBug FixingBuild SystemBuild System ConfigurationBuild SystemsC++C++ DevelopmentCMakeClickHouseClickHouse IntegrationCloud Storage IntegrationCode Refactoring
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