clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- `String` column vs `FixedString` constant: satisfiable AND folded to false
- DeltaLake: a column removed from the lake schema makes every `SELECT *` fail with `NOT_FOUND_COLUMN_IN_BLOCK` instead of the guarded schema-drift error
- Fail a BACKUP/RESTORE ON CLUSTER with the host's error from the DDL queue
- Reject a column SETTINGS name that is not a column-level setting
- Report DeltaLake schema drift with a descriptive error when column mapping is disabled
- Logical error / abort when a processor's `updatePipeline` throws mid-expansion
- Improve canceling queries in HashOutputFormat
- Reject a SETTINGS name that is not a setting at all for database engines
- minmax index prunes rows with NaN in Array/Map on non-negated comparisons
- Do not leave parts on disk when TRUNCATE, DROP PARTITION or MOVE PARTITION fails to commit
- Docs
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