clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Add setting `force_materialized_cte` to throw when a `MATERIALIZED` CTE cannot be materialized
- Honour KILL QUERY when flushing the async-insert queue of a Distributed table
- Forward logs from distributed plan workers to the coordinator
- Store the effective nested SETTINGS clause on the query node and validate it
- Measure WASM UDF input batches whole instead of summing per-row probes
- Reject a non-finite `WITH FILL` bound
- Bound the `{a,b,c}` glob expansion in paths
- Keep a pending partition-scoped mutation out of the other partitions
- Wrong result: an alias-keyed `additional_table_filters` entry is dropped with parallel replicas and `serialize_query_plan = 1`
- Reduce profile-counter memory with hot/cold storage at every level
- Docs
- C++ not yet supported