clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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Help out
- Issues
- Add standard null semantics setting for simple CASE
- Let top-K reads fill the query condition cache when the sort column has a `minmax` index
- JOIN runtime filters: an exact dense bitset instead of a Bloom filter for integer keys in a narrow range makes TPC-H q21, q04 and q22 1.3-2.3x faster
- Faster integer to text conversion for short and wide integers
- Convert literal IN-set members with accurate::convertNumeric instead of a CAST per value
- Answer a repeated count() from exact per-granule match counts in the query condition cache
- Restore OSS-Fuzz coverage builds and seed corpus packaging
- Build the default clickhouse-server Docker image FROM scratch
- Rewrite INTERSECT DISTINCT and EXCEPT DISTINCT to JOIN
- Commit one snapshot per parallel `INSERT`
- Docs
- C++ not yet supported