clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Measure compressed blocks read for AutoPR input bytes instead of sampling
- `KeeperMap` backup dedup keyed by path only: aux-Keeper table data lost
- `min_marks_to_honor_max_concurrent_queries` counts marks a skip index drops
- `INSERT VALUES` stores `{}` for a quoted `Map` with an out-of-range integer
- Cassandra `boolean` copied raw into `Bool`: a non-0x01 true fails `= true`
- Re-adding a method with bare-table `GRANTS` is not deduped after reload
- Compress the `.size` substream of `String` columns with `T64` before the default codec
- Workload resource manager: applying many workload entities is quadratic
- `_distance` rewrite ignores `i8`/`b1` quantization: index units, not distances
- Building IN set from literals ~1.8x slower for wide-int and Date* keys
- Docs
- C++ not yet supported