clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Correlated EXISTS subquery on same table silently returns wrong result (0 instead of correct count)
- Re-resolve function types in buildFilterActionsDAG when argument types change during filter pushdown through JOIN
- Add query plan cache for SELECT queries
- CAST mutation protection
- Create replicated database by default
- Allow skipping last N shards when writing to Distributed table
- Add arrayCombinations, arrayPermutations, arrayPartialPermutations functions
- Runtime filter granule pruning for JOINs via primary key index
- embed extract-from-config tool into clickhouse-keeper binary
- local-disk `MOVE PART` can delay replicated table recovery after Keeper connection loss
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- C++ not yet supported