clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Correlated subquery equivalence substitution loses rows for Array/Tuple/Map with float elements: the stitch join compares bitwise, so -0.0 stops matching 0.0
- Add an `<http>` user directory backed by `<http_authentication_servers>`
- Switch the samples inner table of the TimeSeries engine to a bucketed schema
- Cache part statistics and selectivity estimators to make query planning with statistics cheap
- Backport #113154 to 26.7: Text index: inject tokenizer properly to supported functions outside WHERE/PREWHERE
- Check `allow_statistics` only when validating a mutation, not when running it
- Check if StringHashTable can be abolised in favor of packed strings
- CI: require only one package flavour per Install packages job
- A `Nullable` argument lets a geometry function's `Unknown geometry type` exception disappear when a sibling conjunct filters the block empty
- Let an in-flight replicated DDL entry finish before DETACH DATABASE detaches its tables
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- C++ not yet supported