clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Dict SOURCE/LAYOUT block state machine missing QuotedIdentifier value handling desyncs key-value tracking
- JoinStepLogical stats path in estimateReadRowsCount is unreachable dead code due to children-count guard
- Relaxed preprocessor validation allows FixedString(N) CAST that crashes on longer query constants
- Flaky test: 03237_avro_union_in_complex_types
- ThreadSanitizer: data race (STID: 3336-2c6d)
- Logical error: '(isConst() || isSparse() || isReplicated()) ? getDataType() == rhs.getDataType() : typeid(*this) == typeid(rhs)' (STID: 2508-35cc)
- Logical error: No available columns (STID: 3938-33a6)
- PromQL: _over_time aggregation functions
- Periodically facing "Memory limit exceeded" when the ClickHouse flushes the data to the system.*_log tables
- Grant role to itself
- Docs
- C++ not yet supported