apache/iotdb
Oct 2024 – Aug 2025
3 Months active
Languages Used
JavaSQL
Technical Skills
Backend DevelopmentCompatibilityDeserializationSerializationAlgorithm DevelopmentDatabase Systems
Lin Xintao
PROFILE
Lin Xintao
Worked on the apache/iotdb repository over three months, focusing on backend and algorithm development using Java and SQL. Delivered a pattern match User-Defined Table Function for time-series similarity search, enabling analysts to efficiently identify patterns in large datasets through configurable sketch-based modeling. Enhanced cross-version compatibility for LikeViewExpression, ensuring stable upgrades between major releases by improving serialization, deserialization, and object equality checks. Improved API usability by refining error messaging for the replace function, reducing user confusion and support overhead. Demonstrated skills in database systems, pattern recognition, and robust input validation, contributing to more reliable and maintainable code across releases.
Overall Statistics
Feature vs Bugs
67%Features
Repository Contributions
4Total
Bugs
1
Commits
4
Features
2
Lines of code
2,694
Activity Months3
Your Network
31 peopleWork History
August 2025
1 Commits • 1 Features
Aug 1, 2025August 2025: Delivered a new Pattern Match UDFT feature for time-series similarity search in apache/iotdb. Introduces 'pattern_match' UDFT to query patterns via sketch-based similarity with configurable threshold, width, and height. Commit 0a2166fab5b8297b52f7dfc91c665a827257c3e7 encapsulated the implementation, enabling analysts to perform scalable, pattern-driven inquiries across large datasets.
1 Commits • 1 Features
Aug 1, 2025August 2025: Delivered a new Pattern Match UDFT feature for time-series similarity search in apache/iotdb. Introduces 'pattern_match' UDFT to query patterns via sketch-based similarity with configurable threshold, width, and height. Commit 0a2166fab5b8297b52f7dfc91c665a827257c3e7 encapsulated the implementation, enabling analysts to perform scalable, pattern-driven inquiries across large datasets.
August 2025
March 2025
2 Commits • 1 Features
Mar 1, 2025March 2025 Monthly Summary for Apache IoTDB (repo: apache/iotdb). Focused on improving cross-version view compatibility and reliability of the LikeViewExpression. Key work delivered includes cross-version compatibility between 1.3.X and 2.0.X and robust handling of serialization/deserialization for isNot and escape fields, along with enhanced object equality checks. Key features delivered: - LikeViewExpression Cross-Version Compatibility and Equality Enhancements: Enable stable behavior when upgrading between major versions and ensure correct equality checks across view expressions. Major bugs fixed: - Resolved cross-version deserialization issues in LikeViewExpression and improved equality semantics to prevent incorrect comparisons in downstream components. Technologies/skills demonstrated: - Java-based object design, serialization/deserialization, and cross-version compatibility testing. - Implementation of proper equals methods to support caching, deduplication, and reliable tests. Impact and business value: - Safer upgrade path for customers migrating IoTDB versions, reduced runtime errors in view matching, and more predictable behavior for downstream systems relying on LikeViewExpression and related view components. Commits referenced: - 3f9778a6004e1995a24855bfca7da0ad64c17d45: Compatibility modification for LikeViewExpression deserialization - 5ab0c1adbfdb72aa6338eb25d3c51e530b06a73c: Try to compatiable with 1.3.X view
March 2025
2 Commits • 1 Features
Mar 1, 2025March 2025 Monthly Summary for Apache IoTDB (repo: apache/iotdb). Focused on improving cross-version view compatibility and reliability of the LikeViewExpression. Key work delivered includes cross-version compatibility between 1.3.X and 2.0.X and robust handling of serialization/deserialization for isNot and escape fields, along with enhanced object equality checks. Key features delivered: - LikeViewExpression Cross-Version Compatibility and Equality Enhancements: Enable stable behavior when upgrading between major versions and ensure correct equality checks across view expressions. Major bugs fixed: - Resolved cross-version deserialization issues in LikeViewExpression and improved equality semantics to prevent incorrect comparisons in downstream components. Technologies/skills demonstrated: - Java-based object design, serialization/deserialization, and cross-version compatibility testing. - Implementation of proper equals methods to support caching, deduplication, and reliable tests. Impact and business value: - Safer upgrade path for customers migrating IoTDB versions, reduced runtime errors in view matching, and more predictable behavior for downstream systems relying on LikeViewExpression and related view components. Commits referenced: - 3f9778a6004e1995a24855bfca7da0ad64c17d45: Compatibility modification for LikeViewExpression deserialization - 5ab0c1adbfdb72aa6338eb25d3c51e530b06a73c: Try to compatiable with 1.3.X view
October 2024
1 Commits
Oct 1, 2024Concise monthly summary for 2024-10 focusing on apache/iotdb: key feature delivered, major bugs fixed, overall impact and accomplishments, and technologies/skills demonstrated. Emphasis on business value and precise, actionable outcomes.
1 Commits
Oct 1, 2024Concise monthly summary for 2024-10 focusing on apache/iotdb: key feature delivered, major bugs fixed, overall impact and accomplishments, and technologies/skills demonstrated. Emphasis on business value and precise, actionable outcomes.
October 2024
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Quality Metrics
Correctness82.6%
Maintainability85.0%
Architecture87.6%
Performance75.0%
AI Usage20.0%
Skills & Technologies
Programming Languages
JavaSQL
Technical Skills
Algorithm DevelopmentBackend DevelopmentCompatibilityDatabase SystemsDeserializationPattern RecognitionSerializationTime Series AnalysisUDF Development
Repositories Contributed To
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