citusdata/citus
Mar 2025 – Jul 2025
3 Months active
Languages Used
CSQL
Technical Skills
C ProgrammingDatabase InternalsDistributed SystemsQuery PlanningSQLSQL Query Planning
Cédric Villemain
PROFILE
Cédric Villemain
Worked on the citusdata/citus repository to enhance distributed PostgreSQL extension reliability and security. Over three months, addressed critical bugs in distributed query planning by implementing robust expression validation and improving subquery handling in UPDATE and INSERT statements using C and SQL. Delivered column-level GRANT and REVOKE support, extending DDL propagation and access control logic to ensure precise permissions across distributed tables. Improved reliability of UPDATE operations involving complex array and JSONB subscripting by refining SQL deparsing and target list management. Demonstrated depth in database internals, distributed systems, and query processing, focusing on correctness, safety, and maintainability in production environments.
Overall Statistics
Feature vs Bugs
33%Features
Repository Contributions
4Total
Bugs
2
Commits
4
Features
1
Lines of code
4,424
Activity Months3
Your Network
25 peopleShared Repositories
25
Adam WolkMember
Bahadir Furkan AkgulMember
Alper KocatasMember
Bernd ReißMember
ColmMember
ColmMember
Emel ŞimşekMember
Gürkan İndibayMember
ibrahim halatciMember
Work History
July 2025
1 Commits
Jul 1, 2025July 2025 monthly summary for citusdata/citus focused on reliability improvements for distributed UPDATE statements. Delivered a targeted bug fix addressing indirection and multi-field array/jsonb subscripting, ensuring correct deparsing and handling of complex update scenarios in distributed environments. The change reduces edge-case failures and improves overall correctness of UPDATE operations across shards.
1 Commits
Jul 1, 2025July 2025 monthly summary for citusdata/citus focused on reliability improvements for distributed UPDATE statements. Delivered a targeted bug fix addressing indirection and multi-field array/jsonb subscripting, ensuring correct deparsing and handling of complex update scenarios in distributed environments. The change reduces edge-case failures and improves overall correctness of UPDATE operations across shards.
July 2025
April 2025
1 Commits • 1 Features
Apr 1, 2025Monthly summary for 2025-04 focused on delivering fine-grained access control changes in the distributed CitUS extension and reinforcing security across the distributed cluster.
April 2025
1 Commits • 1 Features
Apr 1, 2025Monthly summary for 2025-04 focused on delivering fine-grained access control changes in the distributed CitUS extension and reinforcing security across the distributed cluster.
March 2025
2 Commits
Mar 1, 2025March 2025 (2025-03): Fixed critical safety and correctness gaps in the citus distributed planner, targeting subquery handling in UPDATE statements and INSERT INTO ... SELECT with subfields/sublinks. Implemented robust expression validation via CheckExprExecutorSafe (manages PARAM_MULTIEXPR and PARAM_SUBLINK), addressed crashes, and expanded regression tests to cover complex sublink scenarios. These changes stabilize distributed query planning and reduce risk of incorrect updates or inserts in production across distributed deployments.
2 Commits
Mar 1, 2025March 2025 (2025-03): Fixed critical safety and correctness gaps in the citus distributed planner, targeting subquery handling in UPDATE statements and INSERT INTO ... SELECT with subfields/sublinks. Implemented robust expression validation via CheckExprExecutorSafe (manages PARAM_MULTIEXPR and PARAM_SUBLINK), addressed crashes, and expanded regression tests to cover complex sublink scenarios. These changes stabilize distributed query planning and reduce risk of incorrect updates or inserts in production across distributed deployments.
March 2025
Activity
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Quality Metrics
Correctness100.0%
Maintainability80.0%
Architecture85.0%
Performance80.0%
AI Usage20.0%
Skills & Technologies
Programming Languages
CSQL
Technical Skills
C ProgrammingDatabase AdministrationDatabase InternalsDistributed SystemsPostgreSQL InternalsQuery PlanningSQLSQL Query PlanningSQL Query Processing
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