clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- `SELECT *` with ANTI/SEMI JOIN incorrectly includes columns from the right table
- Optimize ReplicatedMergeTree queue locks for readonly operations on tables with mutations
- Create table ... clone as does not respect db in fully qualified from table name
- Support DataLake on top of Azure with Delta-kernel
- floor(x, N) returns inaccurate results for specific floating-point numbers (e.g., floor(0.01860, 5) -> 0.01859)
- Uncompressed arrow buffers are marked incorrectly
- Add `PARTITION BY` into `INTO OUTFILE` clause
- Materialize hypothesis index stuck
- Using Set() skip index in query consumes lot of memory and is never released
- PARALLEL WITH improvements
- Docs
- C++ not yet supported