clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Cascades: run a `PARTITION BY` window on each node
- Verify integration nodes reached the requested state after a compose action
- Top-K threshold merge (Fagin's algorithm) for `GROUP BY ... ORDER BY aggregate LIMIT n`
- Do not let an ignored argument with type Nothing change a random function's result type
- Do not create a second query condition cache entry when no skip index ran
- Fix(PromQL): Regex matcher anchoring for alternation
- Add an AArch64 NEON path for hasAll on integer arrays
- Add VersionedCoalescingMergeTree table engine
- Recursive CTE over MergeTree with parallel replicas: logical error `UNION query ... is not recursive` or infinite recursion
- DatabaseMySQL::getTablesIterator throws: one unreachable MySQL DB breaks system.tables
- Docs
- C++ not yet supported