ClickHouse/ClickHouse
Aug 2025 – Oct 2025
3 Months active
Languages Used
C++SQL
Technical Skills
Build SystemsC++Software DevelopmentAggregate FunctionsData SerializationData Structures
Raphaël Thériault
PROFILE
Raphaël Thériault
Worked on the ClickHouse/ClickHouse repository to enhance the stability and reliability of DDSketch integration and quantile aggregate functions. Focused on resolving import and compilation issues by reorganizing header structures and improving include directives in C++, which reduced build failures and improved third-party integration. Addressed edge-case crashes and deserialization vulnerabilities in DDSketch, implementing tolerant equality checks and robust error handling to prevent segfaults during merges. Expanded test coverage for quantileDDMerge aggregates using SQL and database testing techniques, introducing deterministic test setups and refined assertions. These efforts improved build reliability, analytics correctness, and maintainability for distribution-based analytics workloads.
Overall Statistics
Feature vs Bugs
33%Features
Repository Contributions
5Total
Bugs
2
Commits
5
Features
1
Lines of code
284
Activity Months3
Your Network
224 peopleShared Repositories
206
“JiaQiMember
zoomxiMember
sdk2Member
李扬Member
M1eyu2018Member
zhongyuankaiMember
Azat KhuzhinMember
Aleksei BashkeevMember
Aleksandr MusorinMember
Work History
October 2025
2 Commits • 1 Features
Oct 1, 2025Month: 2025-10 — Focused on strengthening test coverage for the quantileDDMerge aggregate in ClickHouse/ClickHouse. Delivered robust test enhancements, stabilized test data setup, and improved test labeling to accommodate dependency requirements, reducing risk in quantileDDMerge results and enabling faster iteration. Key deliverables include a new test file with a reference state and refined assertions, along with excluding specific fast tests when base64Decode dependencies are in play. These changes improve reliability of distributions and merge behavior validation, supporting more confident deployments and easier maintenance.
2 Commits • 1 Features
Oct 1, 2025Month: 2025-10 — Focused on strengthening test coverage for the quantileDDMerge aggregate in ClickHouse/ClickHouse. Delivered robust test enhancements, stabilized test data setup, and improved test labeling to accommodate dependency requirements, reducing risk in quantileDDMerge results and enabling faster iteration. Key deliverables include a new test file with a reference state and refined assertions, along with excluding specific fast tests when base64Decode dependencies are in play. These changes improve reliability of distributions and merge behavior validation, supporting more confident deployments and easier maintenance.
October 2025
September 2025
2 Commits
Sep 1, 2025For 2025-09, delivered stability and safety improvements to DDSketch in ClickHouse/ClickHouse, focusing on fixing edge-case crashes during merges and hardening deserialization. This work improves reliability for analytics workloads by ensuring correct behavior across gamma configurations and robust parsing of serialized sketches. Added tests to guard against regressions and verify correctness of merges and properties of resulting sketches.
September 2025
2 Commits
Sep 1, 2025For 2025-09, delivered stability and safety improvements to DDSketch in ClickHouse/ClickHouse, focusing on fixing edge-case crashes during merges and hardening deserialization. This work improves reliability for analytics workloads by ensuring correct behavior across gamma configurations and robust parsing of serialized sketches. Added tests to guard against regressions and verify correctness of merges and properties of resulting sketches.
August 2025
1 Commits
Aug 1, 2025August 2025 monthly summary for ClickHouse/ClickHouse with focus on DDSketch integration stability. This period prioritized stabilizing third-party integration and build reliability to ensure smooth adoption of observability features in ClickHouse. The primary deliverable was a bug fix for DDSketch imports through reorganization of header structure and include directives to ensure correct compilation and usage within the ClickHouse codebase. This work reduces build failures and improves integration reliability for end-users relying on DDSketch insights.
1 Commits
Aug 1, 2025August 2025 monthly summary for ClickHouse/ClickHouse with focus on DDSketch integration stability. This period prioritized stabilizing third-party integration and build reliability to ensure smooth adoption of observability features in ClickHouse. The primary deliverable was a bug fix for DDSketch imports through reorganization of header structure and include directives to ensure correct compilation and usage within the ClickHouse codebase. This work reduces build failures and improves integration reliability for end-users relying on DDSketch insights.
August 2025
Activity
Loading activity data...
Quality Metrics
Correctness94.0%
Maintainability92.0%
Architecture84.0%
Performance88.0%
AI Usage20.0%
Skills & Technologies
Programming Languages
C++SQL
Technical Skills
Aggregate FunctionsBuild SystemsC++Data SerializationData StructuresDatabase TestingError HandlingSQLSoftware DevelopmentTesting
Repositories Contributed To
Overview of all repositories you've contributed to across your timeline