clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Wrong `count()` from the exact-count projection with a descending sorting key on a tuple with a `Nullable` element
- Upgrade bundled Cyrus SASL to 2.1.28
- Select partitions with an in-memory index of partition values
- Text index: multiSearchAny, match() and multiMatchAny skip the index for needles inside one token, and optimize_or_like_chain turns indexed LIKE/ILIKE chains into such calls; a dictionary scan makes their counts ~95% faster on large parts
- TimeSeries: the rows of a SELECT depend on the columns it reads, so count() over a subquery disagrees with the subquery
- Random test
- WIP: Reuse identical AI function inputs within one query
- Parquet: length(s), empty(s) and s <> '' copy every string; reading only the lengths makes ClickBench q28 26% faster
- Parquet: the query condition cache marks whole row groups and skips filters left in WHERE, so reruns of selective queries decode almost every page again (ClickBench q22 -75%, q23 -53%, q21 -38%)
- PromQL: on top of #122585, keeping the computed steps of partial chunks makes 6 h–7 d dashboard refreshes 1.7–10x faster
- Docs
- C++ not yet supported