clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- GROUPING function argument is not in GROUP BY keys for typles with enable_analyzer=1
- Parallel replicas: a mode with no localhost preference, when even a query with max_parallel_replicas = 1 can be directed to another host
- `max_subquery_depth` setting is weird with `GLOBAL IN` and `enable_analyzer = 1`
- ReplacingMT/CollapsingMT: Insert if not exists
- MaterializedPostgreSQL: order of columns in the primary key is not honoured on the Clickhouse Side
- VersionedCollapsingMergeTree does not fully collapse on OPTIMIZE TABLE FINAL
- Support date, datetime and datetime64 formats for Iceberg table time travel queries
- engine=MySQL + non-responsible server = hanging quires
- Attach partition from Replicated table should take the set of all the parts (including future) not the local state
- Need timeout mechanism for DNS resolve
- Docs
- C++ not yet supported