clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Upgrade to 26.7+: tables with toTime composed with date arithmetic in persisted DDL (e.g. TTL) fail to attach with ILLEGAL_TYPE_OF_ARGUMENT, and use_legacy_to_time cannot heal them because the table loader has no query context
- Upgrade to 26.7+: silent wrong results over parts written under legacy toTime — partition pruning, primary key, skip indexes and projections reinterpret legacy DateTime key values as Time
- MySQL database engine: IS NULL on the null-supplying side of a LEFT JOIN is pushed into the external query when the query has a trailing CROSS JOIN (silent wrong results, 25.3 through 26.7)
- Query-aware scheduling: pluggable scheduler algorithms in a WORKLOAD
- Name the real cause in CREATE TABLE validation errors
- `SET <setting> = DEFAULT` ignores an active `compatibility` setting
- Fix the query condition cache for reads served by projections
- Normalize names used in plan cache key calculation
- Fix segfault in text index on a corrupted posting list
- [CI crash] Expression transform failed during chunk processing
- Docs
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