clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- CBO underestimates multi-key GROUP BY cardinality using max single-column NDV
- Support per-column compression codecs in projections
- A rank() <= N filter above a window sorts every row to compute ranks it discards: bounding the window sort per partition is 16% faster on TPC-DS query_67
- Don't share a query-context-dependent serialization through DataTypesCache
- LDAP: search-and-bind with a service account, `memberOf` role mapping, exclude list, and synchronization of users and roles
- Fix a view returning only the seed row when a recursive CTE is shadowed by a same-named plain CTE
- Add sparse encoding for JSON typed paths with Object V4
- `LIMIT BY` over an injective `GROUP BY` expression throws `NOT_FOUND_COLUMN_IN_BLOCK` when `optimize_injective_functions_in_group_by = 0`
- Bypass compression for small Native protocol frames
- Fix a hang, excessive memory usage and a crash on a filtered read of a Parquet file with a malformed schema
- Docs
- C++ not yet supported