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## Summary - HashTable now dynamically rehashes (doubles capacity) when load factor exceeds 7/8, fixing crash when GROUP BY cardinality > ~1792 - Added configurable `queryNode.segcore.maxGroupByGroups` (default 100K) to cap total groups and prevent OOM on both C++ (per-segment HashTable) and Go (cross-segment agg reducer) layers - Added 4 C++ unit tests covering rehash basic/correctness, max groups limit, and multiple rehash rounds issue: #47569 ## Test plan - [ ] C++ unit tests: `--gtest_filter="*HashTableRehash*:*MaxGroups*"` - [ ] E2E: GROUP BY aggregation with >2K unique values should succeed - [ ] E2E: Set `queryNode.segcore.maxGroupByGroups` to small value, verify clear error message 🤖 Generated with [Claude Code](https://claude.com/claude-code) Signed-off-by: MrPresent-Han <chun.han@gmail.com> Co-authored-by: MrPresent-Han <chun.han@gmail.com> Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>