Month: 2025-12 | Repository: pinterest/starrocks Key features delivered and enhancements: - Data Skew Detection Threshold Enhancement in GroupByCountDistinctDataSkewEliminateRule: Introduced a new data skew row percentage threshold to guide optimization decisions based on statistical distribution, enabling more accurate and timely tuning of execution plans for skewed data sets. Major bugs fixed: - No major bug fixes reported for this month in the provided data. Overall impact and accomplishments: - Improved performance resolution for skewed data patterns by refining skew detection heuristics, contributing to more efficient resource usage and more predictable query performance in large-scale starrocks workloads. - Strengthened traceability and accountability through a clear commit reference and alignment with issue #66640. Technologies/skills demonstrated: - Statistical analysis and data profiling to infer data skew. - Threshold-based heuristics for optimization decision-making. - Code instrumentation and maintainability, with documented and traceable commits. - Collaboration and traceability practices (commit reference and issue linkage).