clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Map key subcolumn optimization (`optimize_functions_to_subcolumns`) never applies through `Distributed` tables
- Load-balance refreshable materialized views across replicas
- Fix top-K dynamic filtering for empty Tuple columns
- Iceberg ENGINE: ALTER DELETE succeeds but does not remove matching rows (silent no-op)
- Docs: Document the power-loss data-loss window for Kafka, NATS and FileLog
- packages.clickhouse.com/deb stable main: aptly mirror update fails with "gzip: invalid header" in clean Docker
- Cherry pick #113964 to 26.6: Fix Iceberg `OPTIMIZE` rejecting multi-row position delete snapshots
- Fix Inconsistent AST formatting for APPLY with a matcher-valued lambda body
- Add tests for the HTTP status code of an unknown role and for a conflicting quota key
- Fix PromQL stddev and stdvar for large finite values
- Docs
- C++ not yet supported