clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Declarative function signatures, continuation of #3775
- RestCatalog / UnityCatalog HTTP client lacks mutex; concurrent DataLakeCatalog reads can race
- `parseDatabaseAndTableNameOrAsterisks` silently converts `db*.table` into `db.table*`
- `which_from_type` in `convertFieldToType` doesn't unwrap `Nullable`, breaking `Date` IN `Nullable(DateTime)` conversions
- Vector similarity index causes incorrect and inconsistent query results across replicas
- `system.detached_tables` throws `NOT_IMPLEMENTED` when iterating over `DatabaseDictionary`
- `SYSTEM SYNC MERGES` hangs forever when scheduled parts don't exist or are dropped
- Vectorise `MD5` with multi-buffer SIMD implementation
- `countmin` statistics give wrong estimates for `Float32` columns due to hash mismatch between column and Field storage
- `checkDropOrRenameCommandDoesntAffectInProgressMutations` doesn't detect conflict between `DROP STATISTICS` and `MATERIALIZE STATISTICS ALL`
- Docs
- C++ not yet supported