clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Use smaller first read task size for read in order with filter
- Route LLVM JIT allocations to a dedicated jemalloc arena
- Refreshable MV: relax sanity checks in SECONDARY_CREATE
- Fix TSan data race in GetPriorityForLoadBalancing::getPriorityFunc
- Reject NaN/Inf and zero-magnitude vectors in vector similarity index
- Add test: `UUIDv7ToDateTime` non-v7 fallback returning epoch is untested
- Fix DISTINCT silently dropped through UNION ALL CTE in RemoveUnusedProjectionColumnsPass
- Add test: `Path::hasGlobsIgnorePlaceholders` early-return branch (no placeholder, raw globs) untested
- Fix CHECK TABLE re-fetch loop on parts with unknown-projection orphan checksum entries
- Improve canceling queries with url() function
- Docs
- C++ not yet supported