clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Use iceberg row and column stats for Cascades CBO
- text index with ngrams tokenizer ignores (?i) in match(s, '(?i)(a|b)') and misses rows
- Iceberg OPTIMIZE fails with CANNOT_DECOMPRESS on gzip-compressed metadata
- `Dynamic`: `NULL` after an expression row in `VALUES` stored as `'NULL'`/`0`
- Iceberg bucket split improvements
- clickhouse-client fails queries that set only one native binary-type flag
- Parquet over many local files: a second pool of decode threads competes with the reading streams; decoding in the reading threads makes short ClickBench queries 5-10% faster
- Support data skipping indices in projections
- Experiment: BOLT release builds with a weekly profile from benchmarks
- Use primary-key proofs to skip filter column reads in aggregations
- Docs
- C++ not yet supported