clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Fix the wrong ordering of the UUID data type
- Fix bitmap subset functions for small-set and promoted signed bitmaps
- Add UUID2 data type with correct sorting
- Bump `datasketch-cpp` with optimization for CountMinSketch
- text/tokenbf_v1/ngrambf_v1 index conditions ignore LowCardinality(String) constants — silent full scan, while primary key and bloom_filter handle the same predicate
- Text index condition does not look through positive boolean wrappers — hasToken(s, 'x') = true scans all granules while bare hasToken(s, 'x') prunes
- Text index on mapKeys/mapValues is not used when the map element key is a Nullable constant
- Subcolumn reads with FINAL on CoalescingMergeTree bypass coalescing on unmerged parts (JSON paths return wrong NULLs; Nullable(Tuple) array elements return wrong defaults)
- optimize_aggregators_of_group_by_keys never eliminates aggregates of LowCardinality GROUP BY keys, blocking HAVING pushdown and skip-index use
- GROUP BY … LIMIT N (no aggregates, no ORDER BY) should early-terminate the read like SELECT DISTINCT … LIMIT N
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- C++ not yet supported