clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Use projections for Merge children missing a SUM measure
- Fix `Merge` reads whose tables produce different column sets
- Do not share the reference counter of cached serializations between threads
- Keep a cluster engine read local with `parallel_replicas_allow_in_with_subquery = 0`
- Reserve disk space for the mutation of a part whose TTL has expired
- Split `max_threads` among the local tasks of a distributed-plan stage
- Fix `ssd_cache` dictionaries with the same `PATH` returning each other's values
- Fix wrong results through a projection after MODIFY COLUMN changes the type of its ORDER BY column
- Fix `Map` subscript matching an out-of-range integer to another key
- A kill between the deduplication log flush and the part commit makes a retried INSERT silently lose rows on plain MergeTree
- Docs
- C++ not yet supported