clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Propagate equi-join predicates without requiring the target primary key
- Do not use the quantized-codes vector search rewrite when the vector column cannot be read lazily
- LDAP: synchronize users and roles of the `ldap` user directory proactively (`sync`)
- ON CLUSTER CLONE AS drops the source: workers create empty tables, no error
- Flaky test test_storage_kafka/test_multi_consumer_quota.py::test_multi_consumer_with_partition_affinity: StorageKafka2 temporary-lock starvation
- An `ALIAS` column defined differently in a child table and its `Merge` table is evaluated from either definition depending on the child's engine, mixing both in one result
- An AST-valued custom setting (`SET SQL_x = disk(...)`) cannot be restored from its `Field` dump: a native-protocol session fails every subsequent query, and any distributed query fails
- `CREATE TABLE ... AS loop(db, t)` makes `t` undroppable (`DROP TABLE t SYNC` never returns) and serves its rows after the drop — `loop` is missing the #118969 veto
- Perf(Math): Avoid materializing constants in clamp
- Server refuses to start after `user_files_path` is changed: an absolute-path `Filesystem` database fails the containment check during startup metadata replay
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- C++ not yet supported