clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- MergeTreeWhereOptimizer: group PREWHERE conjuncts by column set before selectivity estimation
- Restrict parallel-replicas join absorption to the leftmost leaf
- (storage) OneLake: use blob endpoint instead of dfs
- Add ThreadStatus-aware stub for silk fibers
- Fix SYSTEM SYNC MERGES hanging when a scheduled part does not exist
- Add test: Merge-path projection rebuild does not test `_row_exists` propagation into the pre-calculate slim block
- Make stress tests more stressful
- Add lazy partition read option for in-order reading
- Propagate OpenTelemetry context to S3 and Azure
- Logical error: Pipeline stuck still happens
- Docs
- C++ not yet supported