clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Parallel replicas turn a text-index trivial `count()` into a full scan
- Text index: LIKE and ILIKE phrases such as '%Java heap%' read every granule; searching one of their words makes rare phrases about 88% faster
- CSV segmenter opens a quote at any `"`: parallel parsing splits rows
- Fix `NOT_FOUND_COLUMN_IN_BLOCK` when a pending mutation reads a subcolumn that the query also reads
- Improve combineFilter performance for integer arrays on AArch64 using SVE
- Fix index analysis of a filter on a column named like another column's qualified name
- Bound an interserver TablesStatusRequest read before authentication
- Quantized vector search: `vec.quantized` plus `WHERE` fails, column not found
- fix(promql): Delay metric name removal in evaluation.
- claude: document Cloud Agent ClickHouse development setup
- Docs
- C++ not yet supported