clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Immediate statistics serialization
- Read-through filesystem cache for the experimental ReaderExecutor
- Resolve secondary index stream names without constructing index objects
- Rewrite aggregate-free GROUP BY ... LIMIT into SELECT DISTINCT ... LIMIT
- clickhouse-benchmark: do not ping the connection before every query
- Decide parallel replicas eligibility with the subquery's own context
- Make stateless tests parallel-safe with per-test isolation
- Use text index on map element with Nullable constant key
- Text index looks through positive boolean wrappers
- Use token skip indexes for LowCardinality(String) constants
- Docs
- C++ not yet supported