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ChengJi-db

PROFILE

Chengji-db

Worked on backend enhancements for the xupefei/delta and unitycatalog/unitycatalog repositories, focusing on API development and system robustness using Java and Scala. Delivered an internal API refactor to the checkpointing workflow, updating the function signature to accept CatalogTable for richer metadata exposure and future extensibility. Later, implemented a server property in unitycatalog to disable deletion vectors for UniForm IcebergCompatV2 tables, addressing compatibility issues and reducing write failures. The work included targeted feature design, server configuration, unit testing, and documentation updates, demonstrating a methodical approach to backend development and cross-team collaboration while prioritizing maintainability and operational clarity.

Overall Statistics

Feature vs Bugs

100%Features

Repository Contributions

2Total
Bugs
0
Commits
2
Features
2
Lines of code
506
Activity Months2

Work History

June 2026

1 Commits • 1 Features

Jun 1, 2026

June 2026 monthly summary for unitycatalog/unitycatalog focusing on business value and technical delivery. Implemented a server property to disable deletion vectors for UniForm IcebergCompatV2 tables across create/write operations, addressing a key compatibility gap and reducing DV-related write failures. Delivered via a targeted commit and PR work, with tests and documentation updates. Impact includes smoother DV-enabled workflows, fewer runtime errors during table creation, and clearer operator control through server properties. Demonstrated skills in feature design, server configuration, testing, documentation, and cross-team collaboration.

October 2024

1 Commits • 1 Features

Oct 1, 2024

October 2024 focused on stabilizing and future-proofing the checkpointing workflow by improving API surface and metadata exposure. Delivered an internal API refactor to pass CatalogTable to the checkpoint process, enabling richer metadata for more robust checkpointing and easier evolution with catalog-based features.

Activity

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Quality Metrics

Correctness90.0%
Maintainability90.0%
Architecture90.0%
Performance90.0%
AI Usage40.0%

Skills & Technologies

Programming Languages

JavaScala

Technical Skills

API developmentBackend DevelopmentJavaRefactoringbackend developmentunit testing

Repositories Contributed To

2 repos

Overview of all repositories you've contributed to across your timeline

xupefei/delta

Oct 2024 Oct 2024
1 Month active

Languages Used

Scala

Technical Skills

Backend DevelopmentRefactoring

unitycatalog/unitycatalog

Jun 2026 Jun 2026
1 Month active

Languages Used

Java

Technical Skills

API developmentJavabackend developmentunit testing