Summary 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).

June 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.