percona/percona-server
Oct 2024 – Jun 2025
3 Months active
Languages Used
C++SQL
Technical Skills
Bug FixingDatabase OptimizationInnoDBSQL Query OptimizationTest Case DevelopmentC++ Development
Andrzej Jarzabek
PROFILE
Andrzej Jarzabek
Andrzej Jarzabek focused on enhancing data correctness and stability in the percona/percona-server repository by addressing complex bugs in InnoDB and virtual column handling. Over three months, he resolved issues where index merge queries with descending primary keys and cascade updates on virtual columns could yield incorrect or NULL results. Using C++ and SQL, Andrzej implemented targeted changes to internal database logic, such as refining ha_innobase::cmp_ref and virtual column recalculation paths, and developed comprehensive regression tests. His work demonstrated a disciplined approach to bug fixing, prioritizing data integrity and long-term reliability in core database operations without introducing new features.
Overall Statistics
Feature vs Bugs
0%Features
Repository Contributions
3Total
Bugs
3
Commits
3
Features
0
Lines of code
818
Activity Months3
Your Network
733 people
Work History
June 2025
1 Commits
Jun 1, 2025June 2025 monthly summary focusing on stability, data correctness, and business impact. No new features released this month; main focus was a high-impact bug fix to virtual column handling during cascade updates in percona/percona-server, improving data integrity and correctness across cascaded operations. This work reduces risk of NULL propagation and incorrect virtual column values in production, safeguarding query results for client applications.
1 Commits
Jun 1, 2025June 2025 monthly summary focusing on stability, data correctness, and business impact. No new features released this month; main focus was a high-impact bug fix to virtual column handling during cascade updates in percona/percona-server, improving data integrity and correctness across cascaded operations. This work reduces risk of NULL propagation and incorrect virtual column values in production, safeguarding query results for client applications.
June 2025
February 2025
1 Commits
Feb 1, 2025February 2025 monthly summary for percona/percona-server focused on correctness and stability improvements in cascade update paths for virtual columns. A critical bug was fixed to ensure virtual column values are recalculated correctly during cascade updates, preventing NULLs and potential index corruption. The fix enhances data integrity in ON DELETE SET NULL / ON UPDATE SET NULL scenarios and reduces risk in cascading operations. No new features were released this month; this work strengthens core correctness and reliability of virtual columns in cascading updates.
February 2025
1 Commits
Feb 1, 2025February 2025 monthly summary for percona/percona-server focused on correctness and stability improvements in cascade update paths for virtual columns. A critical bug was fixed to ensure virtual column values are recalculated correctly during cascade updates, preventing NULLs and potential index corruption. The fix enhances data integrity in ON DELETE SET NULL / ON UPDATE SET NULL scenarios and reduces risk in cascading operations. No new features were released this month; this work strengthens core correctness and reliability of virtual columns in cascading updates.
October 2024
1 Commits
Oct 1, 20242024-10 Monthly summary for percona/percona-server: Delivered a critical correctness fix in InnoDB's index_merge path for queries with a descending primary key, along with tests to prevent regression. This work improves query accuracy for DESC PK scenarios, reduces production risk, and demonstrates strong testing discipline and targeted code changes.
1 Commits
Oct 1, 20242024-10 Monthly summary for percona/percona-server: Delivered a critical correctness fix in InnoDB's index_merge path for queries with a descending primary key, along with tests to prevent regression. This work improves query accuracy for DESC PK scenarios, reduces production risk, and demonstrates strong testing discipline and targeted code changes.
October 2024
Activity
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Quality Metrics
Correctness100.0%
Maintainability86.6%
Architecture86.6%
Performance73.4%
AI Usage20.0%
Skills & Technologies
Programming Languages
C++SQL
Technical Skills
Bug FixingC++ DevelopmentDatabase InternalsDatabase OptimizationInnoDBSQLSQL Query OptimizationTest Case Development
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