linq2db/linq2db
Aug 2025 – Apr 2026
4 Months active
Languages Used
C#
Technical Skills
API DesignDatabase DevelopmentDatabase IntegrationLINQRefactoringUnit Testing
Jochen Kühner
PROFILE
Jochen Kühner
Worked on the linq2db/linq2db repository to enhance LINQ query reliability, sorting controls, and cross-provider query capabilities using C#, LINQ, and SQL. Delivered new features such as configurable sorting semantics and multi-provider query methods, while also addressing complex bugs like GUID handling in SQLite and translation issues with UnionAll and string member access. The technical approach emphasized robust test coverage, targeted refactoring, and regression prevention, improving the maintainability and correctness of the query generation pipeline. Collaborated across teams to refine fixes, expand test automation, and align backend support, resulting in safer, more predictable LINQ-to-SQL translation and database integration.
Overall Statistics
Feature vs Bugs
40%Features
Repository Contributions
7Total
Bugs
3
Commits
7
Features
2
Lines of code
2,802
Activity Months4
Your Network
18 peopleWork History
April 2026
1 Commits
Apr 1, 2026Month: 2026-04 — Linq2db project: Delivered a critical fix for UnionAll with string member access and strengthened translation pipeline across backends. Key work included fixing translation for Length and IsNullOrEmpty in UnionAll projections, adding tests, and refining the member translation path for unresolved projections. Also expanded test coverage for union-related edge cases (including Informix CHAR_LENGTH) and aligned backend support by disabling Sybase. These changes improve correctness, reliability, and maintainability of LINQ-to-SQL translation, enabling safer complex queries in production and reducing regression risk. Technologies demonstrated include C#, LINQ expression trees, SQL translation, test automation, and cross-team collaboration.
1 Commits
Apr 1, 2026Month: 2026-04 — Linq2db project: Delivered a critical fix for UnionAll with string member access and strengthened translation pipeline across backends. Key work included fixing translation for Length and IsNullOrEmpty in UnionAll projections, adding tests, and refining the member translation path for unresolved projections. Also expanded test coverage for union-related edge cases (including Informix CHAR_LENGTH) and aligned backend support by disabling Sybase. These changes improve correctness, reliability, and maintainability of LINQ-to-SQL translation, enabling safer complex queries in production and reducing regression risk. Technologies demonstrated include C#, LINQ expression trees, SQL translation, test automation, and cross-team collaboration.
April 2026
March 2026
3 Commits • 1 Features
Mar 1, 2026March 2026 monthly summary for the linq2db/linq2db repository focusing on delivering business value through robust cross-provider query capabilities and correctness improvements. Key work included a critical fix for GUID handling in SQLite, plus significant LINQ enhancements with broader multi-provider support and full outer joins.
March 2026
3 Commits • 1 Features
Mar 1, 2026March 2026 monthly summary for the linq2db/linq2db repository focusing on delivering business value through robust cross-provider query capabilities and correctness improvements. Key work included a critical fix for GUID handling in SQLite, plus significant LINQ enhancements with broader multi-provider support and full outer joins.
February 2026
1 Commits
Feb 1, 2026February 2026 — Linq2DB: Focused on robustness of the query optimizer. Implemented a targeted fix to prevent OrderBy + Distinct when ordering by an expression, added regression tests, and reinforced test coverage. These actions improved correctness, stability, and maintainability of the query generation layer.
1 Commits
Feb 1, 2026February 2026 — Linq2DB: Focused on robustness of the query optimizer. Implemented a targeted fix to prevent OrderBy + Distinct when ordering by an expression, added regression tests, and reinforced test coverage. These actions improved correctness, stability, and maintainability of the query generation layer.
February 2026
August 2025
2 Commits • 1 Features
Aug 1, 2025August 2025 focused on strengthening LINQ query reliability and sorting controls in linq2db. Delivered targeted enhancements with robust test coverage for complex IEnumerable scenarios across providers and introduced explicit, configurable sorting semantics. Key improvements include a ConcatenateOrderBy option, a RemoveOrderBy operation to clear sorting, and the deprecation of DoNotClearOrderBys to simplify behavior. Refactoring of OrderBy handling improved consistency and maintainability across the codebase. These changes reduce intermittent errors, improve developer experience, and lay groundwork for safer provider extensions and future performance optimizations.
August 2025
2 Commits • 1 Features
Aug 1, 2025August 2025 focused on strengthening LINQ query reliability and sorting controls in linq2db. Delivered targeted enhancements with robust test coverage for complex IEnumerable scenarios across providers and introduced explicit, configurable sorting semantics. Key improvements include a ConcatenateOrderBy option, a RemoveOrderBy operation to clear sorting, and the deprecation of DoNotClearOrderBys to simplify behavior. Refactoring of OrderBy handling improved consistency and maintainability across the codebase. These changes reduce intermittent errors, improve developer experience, and lay groundwork for safer provider extensions and future performance optimizations.
Activity
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Quality Metrics
Correctness94.2%
Maintainability85.8%
Architecture85.8%
Performance82.8%
AI Usage48.6%
Skills & Technologies
Programming Languages
C#
Technical Skills
API DesignC#C# DevelopmentC# programmingDatabase DevelopmentDatabase IntegrationDatabase ManagementLINQRefactoringSQLUnit Testingdatabase managementunit testing
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