clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Convert native scalars directly in convertColumnToType (fix dictGet regression with direct dictionaries)
- Lightweight UPDATE of a base column returns a stale DEFAULT-column value when both columns are absent from the part (disagrees with heavy ALTER UPDATE)
- Pending CLEAR COLUMN is applied eagerly at read time, but dependent MATERIALIZED columns are not recomputed
- A full-definition ATTACH bypasses the UNIQUE KEY gates that CREATE enforces
- Normalize a table SETTINGS list that states one setting more than once
- RENAME DATABASE can create a self-referential Alias table, denying all unrelated DDL server-wide with INFINITE_LOOP
- Re-derive the exposed buffer end when a packed part member's read bound is raised
- Expose unconfigured system logs in `system.documentation`
- Iceberg OPTIMIZE: attach position deletes by the same rules as SELECT
- Iceberg: reading a table with a Decimal(38, 38) column silently loses rows — rounded-bound compensation overflows Int128 and min-max-prunes the data file
- Docs
- C++ not yet supported