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
Cedric Villemain contributed to the citusdata/citus repository by enhancing distributed query planning and access control in PostgreSQL environments. He implemented robust expression validation in C to address safety and correctness gaps in subquery handling for distributed UPDATE and INSERT operations, reducing the risk of crashes and incorrect data modifications. Cedric also delivered column-level GRANT and REVOKE support, extending distributed DDL propagation and refining ACL checks to enable precise permissions management across nodes. His work included targeted bug fixes for complex SQL scenarios, such as multi-field array and jsonb subscripting, demonstrating deep expertise in database internals, SQL, and distributed systems.
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
20 people
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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