clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Perf(TimeSeries): Keep sparse time series buckets inline
- Fix(PromQL): Validate label names in label_join and label_replace
- canUseIndex ignores MATERIALIZED deps: skip index over m stale after on-fly UPDATE of its source
- startsWith/endsWith needle spliced into a LIKE pattern unescaped: '%' becomes a wildcard
- Execute `INTERSECT DISTINCT` and `EXCEPT DISTINCT` as a semi or anti join
- DROP COLUMN of a missing-column marker named like a subcolumn (`a.size0` next to an `Array` column `a`) deletes the arrays offsets stream from the mutated part
- queryID() in a DEFAULT expression records the async-insert flush id, not the INSERT's query_id
- Automatic parallel replicas: some plan shapes do not hash-match with parallel_replicas_plan_based, so no statistics are collected
- Add written_rows quota resource
- Plan-based parallel replicas: BlocksMarshalling steps are not inserted, so blocks are not marshalled in parallel
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- C++ not yet supported