clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- 26.9: Row-format inserts into nested Tuple tables are up to 3x slower (Kafka ingest 1.8x)
- Optimize skipping delta-encoded parquet values
- Filesystem cache background download bypasses workload IO scheduling
- UTC-bounded DateTime64 window mishandles late 9999-12-31 values behind UTC
- Fix(Geo): Do not match empty polygons in pointInPolygon
- bloom_filter skip index false-negative on has(Array(String), <non-const FixedString(N) needle>) with N>stored len — silent data loss on default use_skip_indexes=1
- Fix(Geo): Support Nullable point coordinates in pointInPolygon
- Bound the whole-chunk reads of the `Parquet` columns cache in more skewed cases
- Support the KIP-848 consumer group protocol in the Kafka engine
- Fix TTL evaluating a subcolumn from a different column than SELECT reads it from
- Docs
- C++ not yet supported