clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Perf(Array): Skip impossible arrayHasSubstr searches
- Add an experimental UNPIVOT clause
- Fix the `_headers` virtual column's position, its cached-count value and a Hive key of the same name
- Enforce the max_waiting_queries server setting
- Enforce storage limits for reads inside a shipped plan fragment
- Skip per-part volume lookups when all volumes allow merges
- count(Nullable) OVER () rewritten to a subcolumn aggregate loses FunctionKind::WINDOW
- UnionNode still charges a subquery level: GLOBAL IN under a UNION needs +1 depth
- Build the deferred set of a column default that contains `IN <table>`
- Keep FunctionKind::WINDOW when a query tree pass rewrites an aggregate function
- Docs
- C++ not yet supported