clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Use the top-K dynamic filter for `ORDER BY` of a single `LowCardinality(String)` column
- MySQL dictionary source: accept `socket` only in the configuration file, connect over TCP for DDL dictionaries
- GROUP BY over a near-unique key with ORDER BY count() DESC LIMIT n: bound group counts before counting them in the adaptive merge (lone-count top-K -27%, ClickBench Q32 -14%)
- Tighten seccomp policy for optional kernel interfaces
- Evaluate remaining low-cost compiler and linker hardening flags
- Measure Clang CFI on the release build configuration
- Resolve each command of an ALTER against the columns the previous commands left
- Make automatic parallel replicas match plans for an INNER JOIN with plan-based parallel replicas
- PIE: measure the runtime cost of the PIE release binaries on amd64 and aarch64
- Measure compressed blocks read for AutoPR input bytes instead of sampling
- Docs
- C++ not yet supported