clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- `TablesDependencyGraph::getTablesSplitByDependencyLevel` aborts the server when the graph contains cyclic dependencies (`resize(SIZE_MAX + 1)` overflow → out-of-bounds vector write)
- Add test: `validateSegmentsCombination` partition+execute and non-sequential-partition rejection paths are untested
- Add test: `SummingMergeTree` merge with expression-based PARTITION/ORDER keys never exercises the new `expression->getRequiredColumns()` exclusion list
- Feature: generateUUIDv3 / generateUUIDv5 (deterministic, namespaced, RFC-4122-compliant UUIDs)
- Feature request: splitByRegexp tokenizer for text indexes (false positives with special-char tokens like C++, C#)
- map_buckets_hash_strategy
- Backport #102825 to 26.3: normalizing format check using lower case
- Logical error: 'prev.thread_id == curr.thread_id'
- Backport #103552 to 25.8: Fix masking nested credentials in logs
- MergeMutate pool permanently wedges on addFuturePartIfNotCoveredByThem
- Docs
- C++ not yet supported