clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Split `parallel_replicas_parallel_distributed_insert_select` from `parallel_distributed_insert_select`
- PR fix in getMonotonicityForRange is bypassed by single_point=true in partition pruner, leaving division-by-zero unfixed for queries without companion x!=0 filter
- max_key_range=65536 too restrictive: legitimate DDSketch queries fail with INCORRECT_DATA
- Include `rows_before_limit_at_least` in `X-ClickHouse-Summary` header
- 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
- Docs
- C++ not yet supported