clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Performance regression for complex CTE+UNION queries in ClickHouse 25 resolved by SET allow_experimental_analyzer = 0
- cancel_http_readonly_queries_on_client_close=1 issue with https requests
- CAST('-0.1', 'DateTime64(1)') returns wrong result
- Various ideas to speed-up build
- Fast single-user look-up in system.users
- Add RowsAfterWhereFilter profile event
- Build sets only once for across the query
- Release unneeded Sets when server or query memory limit is reached.
- Low level tool for repairing mergetree column data
- multiExtractAll — extract matches for an array of patterns in a single pass
- Docs
- C++ not yet supported