clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Read subcolumns after the `FINAL` merge of value-combining engines
- Read all columns of a `...Map` structure in `FINAL` of `SummingMergeTree`
- Do not reuse pooled executable workers with unread replies
- Extend `FMT_DISALLOW_POINTERS` and `_LIBCPP_DISALLOW_PRINTING_POINTERS` to nested and compiled formatting paths
- Update the pool of a Distributed async insert queue in place on cluster reload
- Peak memory blows up when reading big rows that follow small rows: first read of a range is sized by the wrong granule
- Fix huge first read block when big rows follow small rows in a part
- Do not prune parts by `_block_number` and `_block_offset` with `FINAL`
- DeltaLake: delta-kernel block_on waits forever when its result-handoff thread cannot be spawned (fixed upstream in delta-kernel-rs#3202)
- Challenge test: cyclic DEFAULT through quoted tuple subcolumn paths (for #110435)
- Docs
- C++ not yet supported