clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- 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
- Avoid copying column TTL descriptions during merge selection
- `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
- Large merges on object storage deadlock each other on the disk connection limit
- 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
- Perf(JOIN): Skip filtering for all-ones join masks
- A `File` table with an absolute path cannot be dropped and blocks `system.tables` after `user_files_path` is changed; with synchronous load the server refuses to start
- A `URL` engine table becomes undroppable and breaks `system.tables` after `remote_url_allow_hosts` is tightened; with synchronous load the server refuses to start
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- C++ not yet supported