clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- CI: replace `_install_light`/`start_light` with `ClickHouseService` in CI jobs
- Fix wrong values from JIT-compiled if/multiIf with Decimal result
- Rename SYSTEM INSTRUMENT 'parameters' to 'arguments'
- Obsolete settings warnings triggered by server-managed profiles even when value equals default
- Cherry pick #102825 to 26.2: normalizing format check using lower case
- segmentation tokenizer, which more suitable for log data search/patterns
- `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
- MemorySanitizer: use-of-uninitialized-value contrib/cld2/internal/utf8statetable.h
- Docs
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