clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Narrow main-table mark ranges using projection index bitmap
- Fix TSAN data race in executeASTFuzzerQueries clearing caller's transaction
- StorageObjectStorageQueue: fix shutdown blocking on stuck pipeline
- `accurateCastOrNull` Array→QBit returns `[0]` instead of NULL when element conversion is inaccurate
- `applyTrivialInsertSelectOptimization` drops `columns_description` from context, breaking table function structure hints
- `SYNC_FILESYSTEM_CACHE` `formatImpl` drops `filesystem_cache_name` — cache name lost during AST round-trip
- Fix LOGICAL_ERROR in join order optimizer when child headers have duplicate column names
- `JSONExtract` DateTime wraps around for out-of-range dates after `tryReadDateTimeText` changed to saturating
- Wrong `previous_value` in SettingsChangesHistory for `query_plan_max_limit_for_lazy_materialization` in version 25.12
- tests: add a test that triggers crashes in jemalloc with LTO
- Docs
- C++ not yet supported