clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Perf(String): Skip ASCII chunks in UTF-8 source traversal
- Fix TTL GROUP BY for columns with nested LowCardinality types
- Query-level MemoryTracker over-reports ~14-29x with default `pread_threadpool` local reads, falsely triggering MEMORY_LIMIT_EXCEEDED (241) on a memory-rich server
- DeltaLake: Date casts disable file pruning
- Index for LowCardinality is out of range: Dictionary size is 0, but found index with value 0 (INCORRECT_DATA) while reading part
- UBSan: null `query_info.query` dereferenced in `ReadFromMerge::createChildrenPlans` when checking `SAMPLE` (STID: 3593-560a)
- Backport #119214 to 26.3: Parallel replicas for object storage writes
- Fix: Reading Map subcolumns (keys/values) from Parquet returned default (empty) values
- Iceberg writes: use sequence number inheritance in manifests and stop rewriting manifests on commit retry
- Add synth io lags to Iceberg perf CI
- Docs
- C++ not yet supported