clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- cast_not_needed for DateTime64+integer causes Range::shrinkToIncludedIfPossible to step by 1 second, silently dropping subsecond rows
- 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
- Logical error: Shard number is greater than shard count: shard_num=A shard_count=B cluster=C (STID: 5066-564d)
- PromQL: _over_time aggregation functions
- Periodically facing "Memory limit exceeded" when the ClickHouse flushes the data to the system.*_log tables
- The clickhouse service cannot restart the policy because the table does not exist
- Add argMaxMany(N) and argMinMany(N) aggregate functions
- Assertion `(n >= (static_cast<ssize_t>(pad_left_) ? -1 : 0)) && (n <= static_cast<ssize_t>(this->size()))` in `PODArray`
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- C++ not yet supported