clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- null_as_default writes out-of-domain Enum 0 in JSONEachRow/CSV/TSV (Values is correct)
- 100 MB codec threshold compares a codec-dependent size: merges flip LZ4<->ZSTD forever
- Automatically make queries use spilling when reaching memory limits
- Implicit min-max index of an ALIAS column makes INSERT fail when the alias expression cannot be evaluated
- [RFC] OpenTelemetry tracing and introspection of distributed queries
- CLEAR COLUMN does not free a column that a skip index depends on in a packed part
- Add tests for `make_distributed_plan` defects found by stress-testing the local-execution fallback
- Add OverwriteCache table engine
- Workload CPU scheduler: high per-query latency under concurrency from serialized slot acquisition
- A mutation writes an unreadable Compact part when adaptive codec selection meets shared per-granule compression
- Docs
- C++ not yet supported