clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Usability: EXPLAIN indexes=1 does not show projection filtering (index-only _part_offset projections) — presents a pruned read as a full scan
- Lazy materialization for reading Parquet from object storage and Iceberg
- Support identifier query parameters in CREATE ROLE and ALTER ROLE
- Fix identifier resolution when a table has the same name as its database
- convertMySQLDataType wraps Array/Variant-based geo types in Nullable, throwing ILLEGAL_TYPE_OF_ARGUMENT on nullable MySQL spatial columns
- Support parallel replicas for Merge tables and the merge() table function
- Add Remote and RemoteSecure database engines
- Fix Bad cast for GROUP BY ALL WITH ROLLUP scalar subquery under group_by_use_nulls
- Fix ILLEGAL_TYPE_OF_ARGUMENT on nullable MySQL spatial columns
- Fix toTime key-expression type mismatch under use_legacy_to_time
- Docs
- C++ not yet supported