clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- RFC: control on the number of concurrent similar queries
- [CI Proof] Type-less `ALTER ADD COLUMN ... DEFAULT <expr> NULL` silently drops the null modifier; `applyNullModifier` is gated behind an explicit AST type
- Silk fibers aware connection pool
- Make ReadFromMergeTree unused column removal position based
- UNIQUE KEY: probe + dense-index sidecar lifecycle (9b/N)
- Fix logical error in quorum insert recovery when part was discarded by failed-quorum cleanup
- Fix groupConcat behaviour on empty strings
- Harden `ThreadStatus::attachToGroupImpl` against partial attachment failures
- Fix wrong column order in distributed queries with ALIAS columns
- KeeperStorage refactoring
- Docs
- C++ not yet supported