apache/hive
Jun 2025 – Aug 2025
2 Months active
Languages Used
C++JavaPythonRubyTypeScript
Technical Skills
ACID TransactionsC++JavaMetastorePythonReplication
Denys Kuzmenko
PROFILE
Denys Kuzmenko
Over six months, contributed to the apache/hive repository by building and optimizing core data engineering features, focusing on Hive and Iceberg integration. Delivered atomic multi-table transactions, improved query performance through caching and filter pushdown, and enhanced ACID transaction management for reliability. Upgraded dependencies such as Iceberg and streamlined Docker-based deployments for easier maintenance. Addressed complex issues in transaction conflict handling, statistics aggregation, and test coverage, ensuring robust data correctness and operational stability. Leveraged Java, SQL, and Docker to implement backend solutions that improved performance, compatibility, and maintainability for big data workloads, with a strong emphasis on testing and reliability.
Overall Statistics
Feature vs Bugs
0%Features
Repository Contributions
3Total
Bugs
3
Commits
3
Features
0
Lines of code
39,189
Activity Months2
Your Network
158 peopleWork History
August 2025
1 Commits
Aug 1, 2025Summary for 2025-08 (apache/hive). Focused on stability and maintenance for catalog caching. Reverted REST catalog cache changes associated with HIVE-29035 and MetastoreConf cache expiry for Iceberg catalog to undo prior fix, preserving existing behavior and preventing regressions. Commit details include: Revert "HIVE-29035: Fixing cache handling for REST catalog (#5882)" (c7694fdd9b0e75a978e4e1f334f878c77f8ac7d4).
1 Commits
Aug 1, 2025Summary for 2025-08 (apache/hive). Focused on stability and maintenance for catalog caching. Reverted REST catalog cache changes associated with HIVE-29035 and MetastoreConf cache expiry for Iceberg catalog to undo prior fix, preserving existing behavior and preventing regressions. Commit details include: Revert "HIVE-29035: Fixing cache handling for REST catalog (#5882)" (c7694fdd9b0e75a978e4e1f334f878c77f8ac7d4).
August 2025
June 2025
2 Commits
Jun 1, 2025June 2025: Delivered two high-impact fixes across Hive and Calcite, with a focus on data reliability and analytics correctness. Reverted a Hive ACID replication change to disable automatic clearing of dangling transactions on the target, stabilizing incremental replication and reducing data loss risk. Fixed incorrect STDDEV and Covariance results in Calcite for double and decimal inputs by correcting AggregateReduceFunctionsRule behavior; added tests to validate correctness, lowering risk of misleading analytics in dashboards. Overall, these changes improve data integrity, trust in BI reports, and platform stability across the data stack.
June 2025
2 Commits
Jun 1, 2025June 2025: Delivered two high-impact fixes across Hive and Calcite, with a focus on data reliability and analytics correctness. Reverted a Hive ACID replication change to disable automatic clearing of dangling transactions on the target, stabilizing incremental replication and reducing data loss risk. Fixed incorrect STDDEV and Covariance results in Calcite for double and decimal inputs by correcting AggregateReduceFunctionsRule behavior; added tests to validate correctness, lowering risk of misleading analytics in dashboards. Overall, these changes improve data integrity, trust in BI reports, and platform stability across the data stack.
Activity
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Quality Metrics
Correctness80.0%
Maintainability73.4%
Architecture73.4%
Performance60.0%
AI Usage20.0%
Skills & Technologies
Programming Languages
C++JavaPythonRubyTypeScript
Technical Skills
ACID TransactionsC++CachingCatalog ManagementData AnalysisDatabaseJavaMetastorePythonReplicationRubySQLSoftware DevelopmentThriftTypeScript
Repositories Contributed To
Overview of all repositories you've contributed to across your timeline
apache/calcite
Jun 2025 – Jun 2025
1 Month active
Languages Used
Java
Technical Skills
Data AnalysisDatabaseSQLSoftware Development