clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Refuse reading Hudi Merge-on-Read tables whose latest changes are in log files
- Drop the caches when a table is created with an explicit UUID or by replica recovery
- Do not consider a `Replicated` database replica lost because one of its tables failed to load
- Decide comparisons of constants behind `materialize` in the row estimate
- Fix wrong statistics matching in automatic parallel replicas for expressions computing values
- Join reordering estimates multi-key joins from their most selective key; reusing a join's observed selectivity (opt-in) makes TPC-DS q17, q25 and q29 1.9-2.6x faster
- Fix Parquet pruning that skips rows when inverted UInt64 statistics are read as DateTime
- External `LIMIT BY`
- Fix `CURRENT_DATABASE` and other functions written without parentheses being evaluated on remote servers
- [Umbrella] Nightly fuzzer failures: SQLancer, SQLancer++ and the data lake fuzzer
- Docs
- C++ not yet supported