clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- `join_use_nulls = 1` still blocks transitive predicate inference into the left table (single-sided predicate)
- Avoiding Thundering Herd for Query Result Cache
- Include `tests/fuzz` inputs in the fuzzer job digests
- Keeper: put multiple requests into one nuraft log entry
- Fix join filter pushdown
- Fix Kafka consumers lingering after shutdown
- AutoReleases: gate a release candidate on install-packages checks, not the whole CI
- `JSONExtractTree` object traversal builds two temporary `String`s per key: `escapeDotInJSONKey(String(key))` and the shared-data path copy
- Window functions: RANGE peer-group detection pays a per-row equal-range scan when every peer group is a single row (16.6% regression in 26.7)
- Parquet reader: rep/def level processing in `Reader::readRowsInPage` grows its output containers once per value
- Docs
- C++ not yet supported