clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Fsync backup files and directories when writing a backup to local disk
- Fsync snapshot directory in Keeper to survive power loss
- Fix LOGICAL_ERROR in normal projection optimization with correlated subqueries
- Source grants are widened to both `READ` and `WRITE` after an access-entity serialization round trip (`ReplicatedAccessStorage`, `DiskAccessStorage`)
- A default database literally named `NONE` is lost after an access-entity serialization round trip: `ASTDatabaseOrNone` formats it unquoted and the parser reads it back as the `NONE` sentinel
- Fix Time64 to Time cast
- transform_null_in=1 fails for non-nullable String IN nullable subquery result
- Vector similarity index not used when query contains DISTINCT
- Query condition cache poisoned by a parallel-replicas read of Merge over a VIEW — later plain queries silently return 0 rows
- Power loss after `CHECK TABLE` repairs `checksums.txt` bricks the part: the repair write is never fsynced
- Docs
- C++ not yet supported