clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Use the primary key index for `pointInEllipses` over key columns
- FR: Cluster-wide Keeper-mediated session-scoped advisory locks
- Sliced read pool for reading in order
- Do not build aggregate function states from omitted fields in `aggregate_function_input_format` = `value`
- Do not use or carry forward a projection whose parent column is read at another type
- WITH ROLLUP: the input merge combines nothing, every level merge is single-threaded, the sort gets one run per chunk, and the window above pays a serial scatter — TPC-DS query_67 -45%
- ATTACH PARTITION FROM into VersionedCollapsingMergeTree silently produces wrong results
- Spilling DISTINCT on a Float64 key drops rows via comparison-based dedup
- Mutation `IN` literal list skips session-timezone rewrite: wrong rows deleted
- Add `hasAnyTokenLike` and `hasAllTokenLike` functions with text index support
- Docs
- C++ not yet supported