clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- system.tables runs SHOW COLUMNS check per row even without DDL columns selected
- `EXPLAIN WHATIF` skips the merged layout under `use_const_adaptive_granularity`
- `<=>`/`IS DISTINCT FROM` on decimals throw DECIMAL_OVERFLOW from an unused cast
- `DROP PARTITION` via `Alias` of a catalog Iceberg table: `LOGICAL_ERROR`
- Aggregate projection with constant GROUP BY keys breaks all aggregations
- JSON functions don't accept LowCardinality(Nullable) arguments
- `MaterializedPostgreSQL`: Support replicating `REPLICA IDENTITY FULL` tables that have a sorting key.
- Keep WriteBuffer::pos in a register across inlined writes
- Sort strings by 8-byte prefix keys first
- Non-permanent DETACH frees a table_disk root, breaking next load (#124298)
- Docs
- C++ not yet supported